City-states like Sparta, Athens, Thebes and Corinth fought each other as well as the Persians throughout this period, until the Macedonians under Phillip and his son, Alexander the Great, unified the bulk of the Greek states and went on to conquer the Persian Empire. Alexander created an empire of his own that stretched from the Black Sea to Egypt and from Turkey to Western India. On his death, the empire fragmented into a number of Successor States ruled by Alexander's generals. Greek armies consisted largely of armored hoplite spearmen, with a small number of light infantry and cavalry. Macedonian armies are initially built around pikemen and heavy cavalry but as the empire grew so did the range of troops used.