Yes, it was an ecumenical council.

Polish Ecumenical Council was created in 1946.

The ecumenical council refers to a conference of the theological experts and the ecclesiastical dignitaries convened to settle and discuss matters of the various practices of the church. It is also called the oecumenical council.

Vatican Council I was the first Ecumenical Council to be held at the Vatican in Vatican City which is an independent country.

The most recent ecumenical council was the Second Vatican Council, which lasted from October 11, 1962 to December 8, 1965.

The role of the First Vatican Council was an ecumenical Council that defined Papal infallibility and several other doctrinal issues. The role of the Second Vatican Council was purely pastoral.

The Council of Trent took place in Trento, Italy, between the years 1545 and 1563. It was an important ecumenical council of the Catholic Church that addressed issues related to the Protestant Reformation.

The Council of Trent is associated with the religion of Roman Catholicism. It was the 19th ecumenical council and is highly important for it's sweeping decrees of self reform.

A new pope is elected by the College of Cardinals.

An Ecumenical Council, which was presided by the Emperor in Constantinople

The first of such council that was held in Nicea (present day Turkey) in 325 AD and the document produced is today known as 'The Nicene Creed'.

S. Herbert Scott has written:

'General councils and Anglican claims in the light of the Council of Ephesus' -- subject(s): Christian union, Council of Ephesus (431), Councils and synods, Ecumenical, Ecumenical Councils and synods, Popes, Primacy

The ecumenical council refers to a conference of the theological experts and the ecclesiastical dignitaries convened to settle and discuss matters of the various practices of the church. It is also called the oecumenical council.

Vatican Council II was the twenty-first ecumenical Council of the Church. Ecumenical Council, if approved by the reigning Holy Father, be definition, are led by the Holy Spirit, and thus are outside our judgment as mere mortals. Whether it was implemented correctly is a whole different story.

The Nicene Creed was adopted in the city of Nicaea by the First Ecumenical Council, which met there in the year 325.

Ecumenism is கிறிஸ்தவ ஒன்றிப்பு

Eccumenical Council is பொதுச் சங்கம்

Ecumenical Movement is கிறிஸ்தவ ஒன்றிப்பு இயக்கம்

The first ecumenical council of the Christian Church was held in Nicaea in Bithynia (present-day Iznik in Turkey) by the Roman Emperor Constantine I in A.D. 325.

His greatest mission was to call for and establish the groundwork for the Vatican 2 Ecumenical Council.

Popes do not develop out of Councils, Pope call Ecumenical Counsels.

Antonios Kireopoulos has written:

'Ecumenical directions in the United States today' -- subject(s): National Council of the Churches of Christ in the United States of America, Ecumenical movement, National Council of the Churches of Christ in the United States of America. Commission on Faith and Order, Church history, Congresses, History

The ecumenical council is a conference that is convened to mainly discuss church doctrines. This is a meeting that brings together theological experts and ecclesiastical dignitaries.

The 21st of March was when the vernal equinox (or Spring equinox) occured at the time of the First Ecumenical Council in 325 AD, whereas in recent times it occurs on 10th or 11th of March. Easter has always been, and is still celebrated after the vernal equinox, ie. after the 21st of March, in order to comply with the ruling of the Ecumenical Council.

Ecumenical Councils, for the most part, have dealt with heresies, from the first one at Nicaea, which dealt with the Arian heresy through the Council of Trent, which dealt with the protestant heresy. that has been their main function, which a few notable exemptions, the Second Vatican Council dealt with no heresies, nor even any doctrinal issues, it was strictly a pastoral council. Unfortunately, due to the climate of the times, and the deep vein of Modernism which was running underground at the time, heresy followed that Second Vatican Council.

There were seven Ecumenical Councils during this time period. There were any number of Church Councils if you count all the local Councils, but I don't think anyone has ever compiled a list of local councils world-wide for the first millennium.

First Ecumenical Council: Nicaea I (325)

The Council of Nicaea lasted two months and twelve days. Three hundred and eighteen bishops were present. Hosius, Bishop of Cordova, assisted as legate of Pope Sylvester. The Emperor Constantine was also present. To this council we owe The Creed (Symbolum) of Nicaea, defining against Arius the true Divinity of the Son of God (homoousios), and the fixing of the date for keeping Easter (against the Quartodecimans).

Second Ecumenical Council: Constantinople I (381)

The First General Council of Constantinople, under Pope Damasus and the Emperor Theodosius I, was attended by 150 bishops. It was directed against the followers of Macedonius, who impugned the Divinity of the Holy Ghost. To the above-mentioned Nicene Creed it added the clauses referring to the Holy Ghost (qui simul adoratur) and all that follows to the end.

Third Ecumenical Council: Ephesus (431)

The Council of Ephesus, of more than 200 bishops, presided over by St. Cyril of Alexandria representing Pope Celestine I, defined the true personal unity of Christ, declared Mary the Mother of God (theotokos) against Nestorius, Bishop of Constantinople, and renewed the condemnation of Pelagius.

Fourth Ecumenical Council: Chalcedon (451)

The Council of Chalcedon - 150 bishops under Pope Leo the Great and the Emperor Marcian - defined the two natures (Divine and human) in Christ against Eutyches, who was excommunicated.

Fifth Ecumenical Council: Constantinople II (553)

The Second General Council of Constantinople, of 165 bishops under Pope Vigilius and Emperor Justinian I, condemned the errors of Origen and certain writings (The Three Chapters) of Theodoret, of Theodore, Bishop of Mopsuestia and of Ibas, Bishop of Edessa; it further confirmed the first four general councils, especially that of Chalcedon whose authority was contested by some heretics.

Sixth Ecumenical Council: Constantinople III (680-681)

The Third General Council of Constantinople, under Pope Agatho and the Emperor Constantine Pogonatus, was attended by the Patriarchs of Constantinople and of Antioch, 174 bishops, and the emperor. It put an end to Monothelitism by defining two wills in Christ, the Divine and the human, as two distinct principles of operation. It anathematized Sergius, Pyrrhus, Paul, Macarius, and all their followers.

Seventh Ecumenical Council: Nicaea II (787)

The Second Council of Nicaea was convoked by Emperor Constantine VI and his mother Irene, under Pope Adrian I, and was presided over by the legates of Pope Adrian; it regulated the veneration of holy images. Between 300 and 367 bishops assisted.

ANSWER: The Council of Trent took place in the mid-16th century, specifically between the years 1545 and 1563 in Trento and Bologna, northern Italy.

An Ecumenical Council is a Council called by the Pope of all the Bishops in the world to discuss a particular problem or heresy, or group of problems or heresies. If approved by the Holy Father, their rulings are usually infallible (when dealing with matters of faith and morals). The last Ecumenical Council was a little different: the Second Vatican Council was called not to deal with any impending heresies but to call the Church to be more vigorous and up-to-date is spreading the faith outside of the Church.

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Such Councils are very important as they are the work of the Holy Spirit and they show us the way in which to deal with problems and live our lives as good Christians. The Ecumenical Councils:

First Ecumenical Council: Nicaea I (325)

The Council of Nicaea lasted two months and twelve days. Three hundred and eighteen bishops were present. Hosius, Bishop of Cordova, assisted as legate of Pope Sylvester. The Emperor Constantine was also present. To this council we owe The Creed (Symbolum) of Nicaea, defining against Arius the true Divinity of the Son of God (homoousios), and the fixing of the date for keeping Easter (against the Quartodecimans).

Second Ecumenical Council: Constantinople I (381)

The First General Council of Constantinople, under Pope Damasus and the Emperor Theodosius I, was attended by 150 bishops. It was directed against the followers of Macedonius, who impugned the Divinity of the Holy Ghost. To the above-mentioned Nicene Creed it added the clauses referring to the Holy Ghost (qui simul adoratur) and all that follows to the end.

Third Ecumenical Council: Ephesus (431)

The Council of Ephesus, of more than 200 bishops, presided over by St. Cyril of Alexandria representing Pope Celestine I, defined the true personal unity of Christ, declared Mary the Mother of God (theotokos) against Nestorius, Bishop of Constantinople, and renewed the condemnation of Pelagius.

Fourth Ecumenical Council: Chalcedon (451)

The Council of Chalcedon - 150 bishops under Pope Leo the Great and the Emperor Marcian - defined the two natures (Divine and human) in Christ against Eutyches, who was excommunicated.

Fifth Ecumenical Council: Constantinople II (553)

The Second General Council of Constantinople, of 165 bishops under Pope Vigilius and Emperor Justinian I, condemned the errors of Origen and certain writings (The Three Chapters) of Theodoret, of Theodore, Bishop of Mopsuestia and of Ibas, Bishop of Edessa; it further confirmed the first four general councils, especially that of Chalcedon whose authority was contested by some heretics.

Sixth Ecumenical Council: Constantinople III (680-681)

The Third General Council of Constantinople, under Pope Agatho and the Emperor Constantine Pogonatus, was attended by the Patriarchs of Constantinople and of Antioch, 174 bishops, and the emperor. It put an end to Monothelitism by defining two wills in Christ, the Divine and the human, as two distinct principles of operation. It anathematized Sergius, Pyrrhus, Paul, Macarius, and all their followers.

Seventh Ecumenical Council: Nicaea II (787)

The Second Council of Nicaea was convoked by Emperor Constantine VI and his mother Irene, under Pope Adrian I, and was presided over by the legates of Pope Adrian; it regulated the veneration of holy images. Between 300 and 367 bishops assisted.

Eighth Ecumenical Council: Constantinople IV (869)

The Fourth General Council of Constantinople, under Pope Adrian II and Emperor Basil numbering 102 bishops, 3 papal legates, and 4 patriarchs, consigned to the flames the Acts of an irregular council (conciliabulum) brought together by Photius against Pope Nicholas and Ignatius the legitimate Patriarch of Constantinople; it condemned Photius who had unlawfully seized the patriarchal dignity. The Photian Schism, however, triumphed in the Greek Church, and no other general council took place in the East.

Ninth Ecumenical Council: Lateran I (1123)

The First Lateran Council, the first held at Rome, met under Pope Callistus II. About 900 bishops and abbots assisted. It abolished the right claimed by lay princes, of investiture with ring and crosier to ecclesiastical benefices and dealt with church discipline and the recovery of the Holy Land from the infidels.

Tenth Ecumenical Council: Lateran II (1139)

The Second Lateran Council was held at Rome under Pope Innocent II, with an attendance of about 1000 prelates and the Emperor Conrad. Its object was to put an end to the errors of Arnold of Brescia.

Eleventh Ecumenical Council: Lateran III (1179)

The Third Lateran Council took place under Pope Alexander III, Frederick I being emperor. There were 302 bishops present. It condemned the Albigenses and Waldenses and issued numerous decrees for the reformation of morals.

Twelfth Ecumenical Council: Lateran IV (1215)

The Fourth Lateran Council was held under Innocent III. There were present the Patriarchs of Constantinople and Jerusalem, 71 archbishops, 412 bishops, and 800 abbots the Primate of the Maronites, and St. Dominic. It issued an enlarged creed (symbol) against the Albigenses (Firmiter credimus), condemned the Trinitarian errors of Abbot Joachim, and published 70 important reformatory decrees. This is the most important council of the Middle Ages, and it marks the culminating point of ecclesiastical life and papal power.

Thirteenth Ecumenical Council: Lyons I (1245)

The First General Council of Lyons was presided over by Innocent IV; the Patriarchs of Constantinople, Antioch, and Aquileia (Venice), 140 bishops, Baldwin II, Emperor of the East, and St. Louis, King of France, assisted. It excommunicated and deposed Emperor Frederick II and directed a new crusade, under the command of St. Louis, against the Saracens and Mongols.

Fourteenth Ecumenical Council: Lyons II (1274)

The Second General Council of Lyons was held by Pope Gregory X, the Patriarchs of Antioch and Constantinople, 15 cardinals, 500 bishops, and more than 1000 other dignitaries. It effected a temporary reunion of the Greek Church with Rome. The word filioque was added to the symbol of Constantinople and means were sought for recovering Palestine from the Turks. It also laid down the rules for papal elections.

Fifteenth Ecumenical Council: Vienne (1311-1313)

The Council of Vienne was held in that town in France by order of Clement V, the first of the Avignon popes. The Patriarchs of Antioch and Alexandria, 300 bishops (114 according to some authorities), and 3 kings - Philip IV of France, Edward II of England, and James II of Aragon - were present. The synod dealt with the crimes and errors imputed to the Knights Templars, the Fraticelli, the Beghards, and the Beguines, with projects of a new crusade, the reformation of the clergy, and the teaching of Oriental languages in the universities.

Sixteenth Ecumenical Council: Constance (1414-1418)

The Council of Constance was held during the great Schism of the West, with the object of ending the divisions in the Church. It became legitimate only when Gregory XI had formally convoked it. Owing to this circumstance it succeeded in putting an end to the schism by the election of Pope Martin V, which the Council of Pisa (1403) had failed to accomplish on account of its illegality. The rightful pope confirmed the former decrees of the synod against Wyclif and Hus. This council is thus ecumenical only in its last sessions (XLII-XLV inclusive) and with respect to the decrees of earlier sessions approved by Martin V.

Seventeenth Ecumenical Council: Basle/Ferrara/Florence (1431-1439)

The Council of Basle met first in that town, Eugene IV being pope, and Sigismund Emperor of the Holy Roman Empire. Its object was the religious pacification of Bohemia. Quarrels with the pope having arisen, the council was transferred first to Ferrara (1438), then to Florence (1439), where a short-lived union with the Greek Church was effected, the Greeks accepting the council's definition of controverted points. The Council of Basle is only ecumenical till the end of the twenty-fifth session, and of its decrees Eugene IV approved only such as dealt with the extirpation of heresy, the peace of Christendom, and the reform of the Church, and which at the same time did not derogate from the rights of the Holy See. (See also the Council of Florence.)

Eighteenth Ecumenical Council: Lateran V (1512-1517)

The Fifth Lateran Council sat from 1512 to 1517 under Popes Julius II and Leo X, the emperor being Maximilian I. Fifteen cardinals and about eighty archbishops and bishops took part in it. Its decrees are chiefly disciplinary. A new crusade against the Turks was also planned, but came to naught, owing to the religious upheaval in Germany caused by Luther.

Nineteenth Ecumenical Council: Trent (1545-1563)

The Council of Trent lasted eighteen years (1545-1563) under five popes: Paul III, Julius III, Marcellus II, Paul IV and Pius IV, and under the Emperors Charles V and Ferdinand. There were present 5 cardinal legates of the Holy See, 3 patriarchs, 33 archbishops, 235 bishops, 7 abbots, 7 generals of monastic orders, and 160 doctors of divinity. It was convoked to examine and condemn the errors promulgated by Luther and other Reformers, and to reform the discipline of the Church. Of all councils it lasted longest, issued the largest number of dogmatic and reformatory decrees, and produced the most beneficial results.

Twentieth Ecumenical Council: Vatican I (1869-1870)

The Vatican Council was summoned by Pius IX. It met 8 December, 1869, and lasted till 18 July, 1870, when it was adjourned; it is still (1908) unfinished. There were present 6 archbishop-princes, 49 cardinals, 11 patriarchs, 680 archbishops and bishops, 28 abbots, 29 generals of orders, in all 803. Besides important canons relating to the Faith and the constitution of the Church, the council decreed the infallibility of the pope when speaking ex cathedra, i.e. when as shepherd and teacher of all Christians, he defines a doctrine concerning faith or morals to be held by the whole Church.

Vatican Council II 1963-1967

That would be an ecumenical matter.

It was the twenty-first Ecumenical Council of the Catholic Church. The council, through the Holy See, formally opened under the pontificate of Pope John XXIII on 11 October 1962 and closed under Pope Paul VI on the Feast of the Immaculate Conception on December 8, 1965.

That is the sixth amendment. The word is counsel (seeking or getting advice from an attorney).

It is called an Ecumenical Council, and there have been twenty-one of them in the Church's history; they must be called by the reigned pontiff, and their decisions must be approved of by him. Without the Pope's approval, they have no binding. The twenty-one ecumenical councils are:

First Ecumenical Council: Nicaea I (325)

The Council of Nicaea lasted two months and twelve days. Three hundred and eighteen bishops were present. Hosius, Bishop of Cordova, assisted as legate of Pope Sylvester. The Emperor Constantine was also present. To this council we owe The Creed (Symbolum) of Nicaea, defining against Arius the true Divinity of the Son of God (homoousios), and the fixing of the date for keeping Easter (against the Quartodecimans).

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Second Ecumenical Council: Constantinople I (381)

The First General Council of Constantinople, under Pope Damasus and the Emperor Theodosius I, was attended by 150 bishops. It was directed against the followers of Macedonius, who impugned the Divinity of the Holy Ghost. To the above-mentioned Nicene Creed it added the clauses referring to the Holy Ghost (qui simul adoratur) and all that follows to the end.

.

Third Ecumenical Council: Ephesus (431)

The Council of Ephesus, of more than 200 bishops, presided over by St. Cyril of Alexandria representing Pope Celestine I, defined the true personal unity of Christ, declared Mary the Mother of God (theotokos) against Nestorius, Bishop of Constantinople, and renewed the condemnation of Pelagius.

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Fourth Ecumenical Council: Chalcedon (451)

The Council of Chalcedon - 150 bishops under Pope Leo the Great and the Emperor Marcian - defined the two natures (Divine and human) in Christ against Eutyches, who was excommunicated.

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Fifth Ecumenical Council: Constantinople II (553)

The Second General Council of Constantinople, of 165 bishops under Pope Vigilius and Emperor Justinian I, condemned the errors of Origen and certain writings (The Three Chapters) of Theodoret, of Theodore, Bishop of Mopsuestia and of Ibas, Bishop of Edessa; it further confirmed the first four general councils, especially that of Chalcedon whose authority was contested by some heretics.

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Sixth Ecumenical Council: Constantinople III (680-681)

The Third General Council of Constantinople, under Pope Agatho and the Emperor Constantine Pogonatus, was attended by the Patriarchs of Constantinople and of Antioch, 174 bishops, and the emperor. It put an end to Monothelitism by defining two wills in Christ, the Divine and the human, as two distinct principles of operation. It anathematized Sergius, Pyrrhus, Paul, Macarius, and all their followers.

.

Seventh Ecumenical Council: Nicaea II (787)

The Second Council of Nicaea was convoked by Emperor Constantine VI and his mother Irene, under Pope Adrian I, and was presided over by the legates of Pope Adrian; it regulated the veneration of holy images. Between 300 and 367 bishops assisted.

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Eighth Ecumenical Council: Constantinople IV (869)

The Fourth General Council of Constantinople, under Pope Adrian II and Emperor Basil numbering 102 bishops, 3 papal legates, and 4 patriarchs, consigned to the flames the Acts of an irregular council (conciliabulum) brought together by Photius against Pope Nicholas and Ignatius the legitimate Patriarch of Constantinople; it condemned Photius who had unlawfully seized the patriarchal dignity. The Photian Schism, however, triumphed in the Greek Church, and no other general council took place in the East.

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Ninth Ecumenical Council: Lateran I (1123)

The First Lateran Council, the first held at Rome, met under Pope Callistus II. About 900 bishops and abbots assisted. It abolished the right claimed by lay princes, of investiture with ring and crosier to ecclesiastical benefices and dealt with church discipline and the recovery of the Holy Land from the infidels.

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Tenth Ecumenical Council: Lateran II (1139)

The Second Lateran Council was held at Rome under Pope Innocent II, with an attendance of about 1000 prelates and the Emperor Conrad. Its object was to put an end to the errors of Arnold of Brescia.

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Eleventh Ecumenical Council: Lateran III (1179)

The Third Lateran Council took place under Pope Alexander III, Frederick I being emperor. There were 302 bishops present. It condemned the Albigenses and Waldenses and issued numerous decrees for the reformation of morals.

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Twelfth Ecumenical Council: Lateran IV (1215)

The Fourth Lateran Council was held under Innocent III. There were present the Patriarchs of Constantinople and Jerusalem, 71 archbishops, 412 bishops, and 800 abbots the Primate of the Maronites, and St. Dominic. It issued an enlarged creed (symbol) against the Albigenses (Firmiter credimus), condemned the Trinitarian errors of Abbot Joachim, and published 70 important reformatory decrees. This is the most important council of the Middle Ages, and it marks the culminating point of ecclesiastical life and papal power.

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Thirteenth Ecumenical Council: Lyons I (1245)

The First General Council of Lyons was presided over by Innocent IV; the Patriarchs of Constantinople, Antioch, and Aquileia (Venice), 140 bishops, Baldwin II, Emperor of the East, and St. Louis, King of France, assisted. It excommunicated and deposed Emperor Frederick II and directed a new crusade, under the command of St. Louis, against the Saracens and Mongols.

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Fourteenth Ecumenical Council: Lyons II (1274)

The Second General Council of Lyons was held by Pope Gregory X, the Patriarchs of Antioch and Constantinople, 15 cardinals, 500 bishops, and more than 1000 other dignitaries. It effected a temporary reunion of the Greek Church with Rome. The word filioque was added to the symbol of Constantinople and means were sought for recovering Palestine from the Turks. It also laid down the rules for papal elections.

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Fifteenth Ecumenical Council: Vienne (1311-1313)

The Council of Vienne was held in that town in France by order of Clement V, the first of the Avignon popes. The Patriarchs of Antioch and Alexandria, 300 bishops (114 according to some authorities), and 3 kings - Philip IV of France, Edward II of England, and James II of Aragon - were present. The synod dealt with the crimes and errors imputed to the Knights Templars, the Fraticelli, the Beghards, and the Beguines, with projects of a new crusade, the reformation of the clergy, and the teaching of Oriental languages in the universities.

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Sixteenth Ecumenical Council: Constance (1414-1418)

The Council of Constance was held during the great Schism of the West, with the object of ending the divisions in the Church. It became legitimate only when Gregory XI had formally convoked it. Owing to this circumstance it succeeded in putting an end to the schism by the election of Pope Martin V, which the Council of Pisa (1403) had failed to accomplish on account of its illegality. The rightful pope confirmed the former decrees of the synod against Wyclif and Hus. This council is thus ecumenical only in its last sessions (XLII-XLV inclusive) and with respect to the decrees of earlier sessions approved by Martin V.

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Seventeenth Ecumenical Council: Basle/Ferrara/Florence (1431-1439)

The Council of Basle met first in that town, Eugene IV being pope, and Sigismund Emperor of the Holy Roman Empire. Its object was the religious pacification of Bohemia. Quarrels with the pope having arisen, the council was transferred first to Ferrara (1438), then to Florence (1439), where a short-lived union with the Greek Church was effected, the Greeks accepting the council's definition of controverted points. The Council of Basle is only ecumenical till the end of the twenty-fifth session, and of its decrees Eugene IV approved only such as dealt with the extirpation of heresy, the peace of Christendom, and the reform of the Church, and which at the same time did not derogate from the rights of the Holy See. (See also the Council of Florence.)

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Eighteenth Ecumenical Council: Lateran V (1512-1517)

The Fifth Lateran Council sat from 1512 to 1517 under Popes Julius II and Leo X, the emperor being Maximilian I. Fifteen cardinals and about eighty archbishops and bishops took part in it. Its decrees are chiefly disciplinary. A new crusade against the Turks was also planned, but came to naught, owing to the religious upheaval in Germany caused by Luther.

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Nineteenth Ecumenical Council: Trent (1545-1563)

The Council of Trent lasted eighteen years (1545-1563) under five popes: Paul III, Julius III, Marcellus II, Paul IV and Pius IV, and under the Emperors Charles V and Ferdinand. There were present 5 cardinal legates of the Holy See, 3 patriarchs, 33 archbishops, 235 bishops, 7 abbots, 7 generals of monastic orders, and 160 doctors of divinity. It was convoked to examine and condemn the errors promulgated by Luther and other Reformers, and to reform the discipline of the Church. Of all councils it lasted longest, issued the largest number of dogmatic and reformatory decrees, and produced the most beneficial results.

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Twentieth Ecumenical Council: Vatican I (1869-1870)

The Vatican Council was summoned by Pius IX. It met 8 December, 1869, and lasted till 18 July, 1870, when it was adjourned; it is still (1908) unfinished. There were present 6 archbishop-princes, 49 cardinals, 11 patriarchs, 680 archbishops and bishops, 28 abbots, 29 generals of orders, in all 803. Besides important canons relating to the Faith and the constitution of the Church, the council decreed the infallibility of the pope when speaking ex cathedra, i.e. when as shepherd and teacher of all Christians, he defines a doctrine concerning faith or morals to be held by the whole Church.

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Twenty-first Ecumenical Council: Vatican II ( 1962-1965)

The Second Vatican Council was held at the Vatican, obviously, Ecumenical Council are named after the location where they are held, this was the Second Ecumenical Council to be held at the Vatican. It was convened in 1962 by Blessed Pope John XXIII, of happy memory; it was closed by Pope Paul VI, of happy memory, on December 8, 1965. It's purpose, according to Pope John XXIII was to "update the Church" to bring its presentation of the faith up to modern standards in order to better evangelize the world, and to call individual Christians to a deeper holiness.

It's just Catholic, not Roman Catholic. Roman is an epithet first commonly used in England after the protestant revolt to describe the Catholic Church. It is never used by the official Catholic Church. Not to pick on you, but the Catholic Church has been around for a long time (2,000 years) and has been constantly reforming due to the fact that she is made up entirely of sinful human beings. Usually reform came about through the Ecumenical Councils which were named after the towns that they were held:

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First Ecumenical Council: Nicaea I (325)

The Council of Nicaea lasted two months and twelve days. Three hundred and eighteen bishops were present. Hosius, Bishop of Cordova, assisted as legate of Pope Sylvester. The Emperor Constantine was also present. To this council we owe The Creed (Symbolum) of Nicaea, defining against Arius the true Divinity of the Son of God (homoousios), and the fixing of the date for keeping Easter (against the Quartodecimans).

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Second Ecumenical Council: Constantinople I (381)

The First General Council of Constantinople, under Pope Damasus and the Emperor Theodosius I, was attended by 150 bishops. It was directed against the followers of Macedonius, who impugned the Divinity of the Holy Ghost. To the above-mentioned Nicene Creed it added the clauses referring to the Holy Ghost (qui simul adoratur) and all that follows to the end.

.

Third Ecumenical Council: Ephesus (431)

The Council of Ephesus, of more than 200 bishops, presided over by St. Cyril of Alexandria representing Pope Celestine I, defined the true personal unity of Christ, declared Mary the Mother of God (theotokos) against Nestorius, Bishop of Constantinople, and renewed the condemnation of Pelagius.

.

Fourth Ecumenical Council: Chalcedon (451)

The Council of Chalcedon - 150 bishops under Pope Leo the Great and the Emperor Marcian - defined the two natures (Divine and human) in Christ against Eutyches, who was excommunicated.

.

Fifth Ecumenical Council: Constantinople II (553)

The Second General Council of Constantinople, of 165 bishops under Pope Vigilius and Emperor Justinian I, condemned the errors of Origen and certain writings (The Three Chapters) of Theodoret, of Theodore, Bishop of Mopsuestia and of Ibas, Bishop of Edessa; it further confirmed the first four general councils, especially that of Chalcedon whose authority was contested by some heretics.

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Sixth Ecumenical Council: Constantinople III (680-681)

The Third General Council of Constantinople, under Pope Agatho and the Emperor Constantine Pogonatus, was attended by the Patriarchs of Constantinople and of Antioch, 174 bishops, and the emperor. It put an end to Monothelitism by defining two wills in Christ, the Divine and the human, as two distinct principles of operation. It anathematized Sergius, Pyrrhus, Paul, Macarius, and all their followers.

.

Seventh Ecumenical Council: Nicaea II (787)

The Second Council of Nicaea was convoked by Emperor Constantine VI and his mother Irene, under Pope Adrian I, and was presided over by the legates of Pope Adrian; it regulated the veneration of holy images. Between 300 and 367 bishops assisted.

.

Eighth Ecumenical Council: Constantinople IV (869)

The Fourth General Council of Constantinople, under Pope Adrian II and Emperor Basil numbering 102 bishops, 3 papal legates, and 4 patriarchs, consigned to the flames the Acts of an irregular council (conciliabulum) brought together by Photius against Pope Nicholas and Ignatius the legitimate Patriarch of Constantinople; it condemned Photius who had unlawfully seized the patriarchal dignity. The Photian Schism, however, triumphed in the Greek Church, and no other general council took place in the East.

.

Ninth Ecumenical Council: Lateran I (1123)

The First Lateran Council, the first held at Rome, met under Pope Callistus II. About 900 bishops and abbots assisted. It abolished the right claimed by lay princes, of investiture with ring and crosier to ecclesiastical benefices and dealt with church discipline and the recovery of the Holy Land from the infidels.

.

Tenth Ecumenical Council: Lateran II (1139)

The Second Lateran Council was held at Rome under Pope Innocent II, with an attendance of about 1000 prelates and the Emperor Conrad. Its object was to put an end to the errors of Arnold of Brescia.

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Eleventh Ecumenical Council: Lateran III (1179)

The Third Lateran Council took place under Pope Alexander III, Frederick I being emperor. There were 302 bishops present. It condemned the Albigenses and Waldenses and issued numerous decrees for the reformation of morals.

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Twelfth Ecumenical Council: Lateran IV (1215)

The Fourth Lateran Council was held under Innocent III. There were present the Patriarchs of Constantinople and Jerusalem, 71 archbishops, 412 bishops, and 800 abbots the Primate of the Maronites, and St. Dominic. It issued an enlarged creed (symbol) against the Albigenses (Firmiter credimus), condemned the Trinitarian errors of Abbot Joachim, and published 70 important reformatory decrees. This is the most important council of the Middle Ages, and it marks the culminating point of ecclesiastical life and papal power.

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Thirteenth Ecumenical Council: Lyons I (1245)

The First General Council of Lyons was presided over by Innocent IV; the Patriarchs of Constantinople, Antioch, and Aquileia (Venice), 140 bishops, Baldwin II, Emperor of the East, and St. Louis, King of France, assisted. It excommunicated and deposed Emperor Frederick II and directed a new crusade, under the command of St. Louis, against the Saracens and Mongols.

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Fourteenth Ecumenical Council: Lyons II (1274)

The Second General Council of Lyons was held by Pope Gregory X, the Patriarchs of Antioch and Constantinople, 15 cardinals, 500 bishops, and more than 1000 other dignitaries. It effected a temporary reunion of the Greek Church with Rome. The word filioque was added to the symbol of Constantinople and means were sought for recovering Palestine from the Turks. It also laid down the rules for papal elections.

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Fifteenth Ecumenical Council: Vienne (1311-1313)

The Council of Vienne was held in that town in France by order of Clement V, the first of the Avignon popes. The Patriarchs of Antioch and Alexandria, 300 bishops (114 according to some authorities), and 3 kings - Philip IV of France, Edward II of England, and James II of Aragon - were present. The synod dealt with the crimes and errors imputed to the Knights Templars, the Fraticelli, the Beghards, and the Beguines, with projects of a new crusade, the reformation of the clergy, and the teaching of Oriental languages in the universities.

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Sixteenth Ecumenical Council: Constance (1414-1418)

The Council of Constance was held during the great Schism of the West, with the object of ending the divisions in the Church. It became legitimate only when Gregory XI had formally convoked it. Owing to this circumstance it succeeded in putting an end to the schism by the election of Pope Martin V, which the Council of Pisa (1403) had failed to accomplish on account of its illegality. The rightful pope confirmed the former decrees of the synod against Wyclif and Hus. This council is thus ecumenical only in its last sessions (XLII-XLV inclusive) and with respect to the decrees of earlier sessions approved by Martin V.

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Seventeenth Ecumenical Council: Basle/Ferrara/Florence (1431-1439)

The Council of Basle met first in that town, Eugene IV being pope, and Sigismund Emperor of the Holy Roman Empire. Its object was the religious pacification of Bohemia. Quarrels with the pope having arisen, the council was transferred first to Ferrara (1438), then to Florence (1439), where a short-lived union with the Greek Church was effected, the Greeks accepting the council's definition of controverted points. The Council of Basle is only ecumenical till the end of the twenty-fifth session, and of its decrees Eugene IV approved only such as dealt with the extirpation of heresy, the peace of Christendom, and the reform of the Church, and which at the same time did not derogate from the rights of the Holy See. (See also the Council of Florence.)

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Eighteenth Ecumenical Council: Lateran V (1512-1517)

The Fifth Lateran Council sat from 1512 to 1517 under Popes Julius II and Leo X, the emperor being Maximilian I. Fifteen cardinals and about eighty archbishops and bishops took part in it. Its decrees are chiefly disciplinary. A new crusade against the Turks was also planned, but came to naught, owing to the religious upheaval in Germany caused by Luther.

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Nineteenth Ecumenical Council: Trent (1545-1563)

The Council of Trent lasted eighteen years (1545-1563) under five popes: Paul III, Julius III, Marcellus II, Paul IV and Pius IV, and under the Emperors Charles V and Ferdinand. There were present 5 cardinal legates of the Holy See, 3 patriarchs, 33 archbishops, 235 bishops, 7 abbots, 7 generals of monastic orders, and 160 doctors of divinity. It was convoked to examine and condemn the errors promulgated by Luther and other Reformers, and to reform the discipline of the Church. Of all councils it lasted longest, issued the largest number of dogmatic and reformatory decrees, and produced the most beneficial results.

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Twentieth Ecumenical Council: Vatican I (1869-1870)

The Vatican Council was summoned by Pius IX. It met 8 December, 1869, and lasted till 18 July, 1870, when it was adjourned; it is still (1908) unfinished. There were present 6 archbishop-princes, 49 cardinals, 11 patriarchs, 680 archbishops and bishops, 28 abbots, 29 generals of orders, in all 803. Besides important canons relating to the Faith and the constitution of the Church, the council decreed the infallibility of the pope when speaking ex cathedra, i.e. when as shepherd and teacher of all Christians, he defines a doctrine concerning faith or morals to be held by the whole Church.

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Twenty-first Ecumenical Council: Vatican II ( 1962-1965)

Ecumenical Catholic Church was created in 1987.

Bossey Ecumenical Institute was created in 1946.

Ecumenical Catholic Communion was created in 2003.

Institute of Ecumenical Studies was created in 2004.

Ecumenical Christian Centre was created in 1963.

No, Iconoclasm was the movement that did not believe in venerating (honoring) icons. The beliefs of this movement were condemned as false during the Seventh Ecumenical Council of the whole church, which condemned Iconoclasm and declared that the veneration of icons was an essential part of the Christian Faith.