Alexander the Great was king of which ancient kingdom?

Alexander the Great was king of the ancient kingdom of Macedon. He inherited the throne of Macedon in 336 BC after the assassination of his father, Philip II, and ruled until his death in 323 BC.

Macedon lay in the northern part of the Greek world, north of the major city-states such as Athens, Sparta, and Thebes. Under Philip II, it became the dominant power in Greece. Alexander used his father's military reforms and political alliances to lead Macedon and its Greek allies against the Persian Empire.

During Alexander's reign, Macedonian armies conquered an enormous territory stretching from Greece and Egypt through Persia and as far east as parts of modern Pakistan. His empire helped spread Greek language and culture across the eastern Mediterranean and Asia, beginning the Hellenistic period.

A common mix-up is calling Alexander king of Greece or Persia. He was king of Macedon; he later controlled Greece and conquered the Persian Empire, but those were territories or political spheres under his rule rather than the kingdom he inherited.