Archaeological site of Pella, Greece, Alexander's birthplace Alexander III was born in Pella, the capital of the Kingdom of Macedon, [11] on the sixth day of the ancient Greek month of Hekatombaion, which probably corresponds to 20 July BC (although the exact date is uncertain). [12][13] He was the son of the king of Macedon, Philip II of the Argead dynasty and his fourth wife, Olympias.