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There is no Islamic Empire.
what empire
The title of the Islamic Empire was Caliphate. The Caliph was called Amir-ul-Momineen.
It depends on the Islamic Empire in question. Assuming that you are talking about the Abbassid Caliphate (which is most commonly referred to as "the Islamic Empire"), the group that brought them down was the MONGOLS.
In 1492 the Islamic Empire finally left Spain but i dont know when it began.
During the golden age of the Islamic empire, many advancements were made in lots of different areas. New forms of art were created, and new ways of thinking, including the beginnings of the mathematic system of algebra, emerged as well.
Yes. The Mughal Empire was a great Empire of the Muslims in India.
Different in different parts of the empire.
Ottoman Empire
The Abbasids, as the ones from the Islamic Empire.
The period of disorder after the decline of the Roman Empire led to an extended period of disunity during the Middle Ages that was characterized by feudalism.
Invasions by the Islamic Ottoman Empire destroyed the Byzantine Empire.