Greek Empire

When Alexander the Great died at the age of 32, his empire stretched from the Adriatic Sea in the west all the way to modern-day India in the east. In an unusual compromise, his two heirs - a mentally damaged half brother, Philip III, and an infant son, Alexander IV, born after his death - were jointly granted the kingship. But six of Alexander's Macedonian generals, spurred by their own thirst for power and the legend that Alexander bequeathed his rule "to the strongest," fought to gain supremacy.

In the second half of the tenth century, Byzantium embarked on a series of spectacular conquests. By the early eleventh century, the empire was the most powerful state in the Mediterranean. Yet this imperial project came to a crashing collapse fifty years later, when political disunity, fiscal mismanagement, and defeat at the hands of the Seljuks and the Normans brought an end to Byzantine hegemony. By 1081, Byzantium's very existence was threatened.