Alexander the Great served as king of Macedonia from 336 to 323 B.C. During his time of leadership, he united Greece, reestablished the Corinthian League and conquered the Persian Empire.Conqueror and king of Macedonia, Alexander the Great was born on July 20, 356 B.C., in Pella, Macedonia. During his leadership, from 336 to 323 B.C., he united the Greek city-states and led the Corinthian League. He also became the king of Persia, Babylon and Asia, and created Macedonian colonies in the region. While considering the conquests of Carthage and Rome, Alexander died of malaria in Babylon (now Iraq), on June 13, 323 B.C.