Harpalus (Greek: Ἅρπαλος), son of Machatas, was a Macedonian aristocrat and childhood friend of Alexander the Great in the 4th century BC.[1] Harpalus was repeatedly entrusted with official duties by Alexander and absconded with large sums of money on three occasions.[2] Alexander appointed him treasurer of his empire in Babylon in 330 BC. In 324 BC he fled from Babylon to Athens with a large sum of money. The resulting political controversy in Athens ("the Harpalus Affair") was a contributing factor in the Lamian War.