Why did Alexander believe he was the son of Zeus?

Alexander the great believed he was the son of Zeus partly due to his mother's claims and the oracle of Delphi. His mother, Olympias, suggested that he was divinely conceived, which aligned with his ambitions of greatness. Additionally, Alexander sought to legitimize his rule and connect himself to the divine, enhancing his authority and status as a leader. By presenting himself as the son of Zeus, he reinforced his image as a semi-divine figure destined for conquest.