Aristides,(530?–468? B.C.), an Athenian statesman and military leader. He was called "the Just" because of his complete honesty in an era when corruption was common. Aristides was a general at the Battle of Marathon (490 B.C.), in which the Greeks defeated an invading Persian army. The next year he was elected an archon, or magistrate, of Athens. Aristides was an aristocrat and a conservative. His political rival, Themistocles, leader of the democratic faction, succeeded in having him ostracized (banished) about 482 B.C.

Aristides was recalled from exile in 480 because of a new Persian invasion. He took part in the Greek victory at Salamis and in 479 commanded the Athenian heavy infantry at Plataea, where the Persians met final defeat. In 477 Aristides was chosen to organize the Delian League, a confederation of Greek city-states established for mutual defense against the Persians. His decision as to the contribution to be made by each member was considered fair by all.