Mehmet II Ottoman Sultan ruled from 1444 to 1486. He was known as Mehmet the Conqueror. He conquered: Greece, Constantinople, Albania and most of eastern Europe. Justinian I was a powerful ruler of the Byzantine Empire and known as Justinian the Great. Babur was a conqueror, whose descendants formed the powerful Mughal Dynasty of England. Akbar was a descendant of Babur and one of the greatest rulers of the Mughal Dynasty. His nickname, Akbar-e-Azam, literally means Great the Great.