The Battle of Lade (Greek: Ναυμαχία τῆς Λάδης, Naumachia tēs Ladēs) was a naval battle which occurred during the Ionian Revolt, in 494 BC. It was fought between an alliance of the Ionian cities (joined by the Lesbians) and the Persian Empire of Darius the Great, and resulted in a decisive victory for the Persians which all but ended the revolt.