The end of the Roman Empire up to the Norman invasion of England in 1066 is the period known as the Dark Ages. The end of the Dark Ages is often counted as the beginning of the Middle Ages in British History.
No
The Late Middle Ages started in about 1300 and lasted until 1450 or 1500. There is a link below to an article on the subject.
Some people regard the Middle Ages as beginning when the ancient times ended. Others have the ancient times ending in the middle of the 5th century, and the Middle Ages starting in the 11th. According to the first of these, the time between the ancient times and the Middle Ages is called the Early Middle Ages, but the later usage would have it be called the Dark Ages.
At the beginning of the High Middle Ages, the architecture was Romanesque. Later in that time, the Gothic emerged.
This period is called the Middle Ages, a period of little scholastic advancement in Europe that leads to its other name, the Dark Ages.
Yes, polyphony was used during the Middle Ages. We do not have any real idea of when polyphony was introduced, but the earliest texts describing it date to the Early Middle Ages. By the end of the Middle Ages, it was highly developed. There is a link below to an article on polyphony, beginning at the section on its origins.
The event which historians consider as marking the end of the western part of the Roman Empire and the beginning of the Middle Ages (not dark ages) is the deposition of Romulus Augustus, the last emperor of the western part of the empire in 476.
Some of the problems encountered when defining the beginning of the Middle Ages is determining the beginning of Christianity and coinciding that with the fall of Rome.
The Middle Ages started in "1100 - 1520"
The Middle Ages began in the 5th century and end in the 15th century.
war
The next age after the Middle Ages was the Renaissance or Early Modern Age. There is a bit of overlap between the two, as the Renaissance is taken as beginning about 1350 and the Middle Ages ending about 1450 or so.
Kingdom of Armenia - Middle Ages - ended in 1045.
middle
1450s
No
At the beginning of the Middle Ages when Rome fell.