Alexander V of Macedon (Greek: Ἀλέξανδρος Εʹ ὁ Μακεδών; died 294 BC) was the third and youngest son of Cassander and Thessalonica of Macedon, who was a half-sister of Alexander the Great.[1] He ruled as King of Macedon along with his brother Antipater from 297 to 294 BC.