Pope Pius IX convened the First Vatican Council which began in 1868.
Pope John XXIII convened the Second Vatican Council which began in 1962.
Pope Paul VI reconvened the Second Vatican Council in 1963 after it was suspended due to the death of Pope John.
Pope John had to close the First Vatican Council before opening the Second Council since the First Council was never officially closed by Pius, it ended abruptly, or temporarily suspended because the Franco-Prussian War broke out and the bishops in attendance wanted to return to their diocese. After Rome was captured, Pope Pius permanently suspended the Council but did not close it officially.
Pope John died during the intermission break between the first and second session of the Second Council to which it was suspended. Once Cardinal Giovanni Montini was elected as Pope Paul VI, he reconvened the Second Council and presided over it until its ending in 1965.
1962
First of all, it was Pope Pius IX, not Pius II who convened and then presided over Vatican I or the First Vatican Council. Pius IX, called it for the review of the topics that was being dealt in the Church which was: rationalism, liberalism, materialism, inspiration of Scripture, and papal infallibility.
Popes John XXIII and Paul VI were popes during Vatican II.
Pope Paul VI closed Vatican II.
Pope John XXIII convened the Council and Pope Paul VI made the changes to the Mass.
Pope John Paul II lived and worked in Vatican City.
Roman Catholic AnswerThe last Ecumenical Council of the Church was Vatican Council II, held in the early 1960's at the Vatican. For a list list of all 21 Ecumenical Councils see the link below.
Pope John XXXIII initiated the Second Vatican Council also known as "Vatican II"
Pope John Paul II died in the Vatican in April 2005.
Vatican Council II
Pope John XXIII called the council.
Any Pope, like Pope John Paul II.