• King Xerxes I of Persia sets out to conquer Greece.
• August 11 Battle of Thermopylae.
• Pleistarchus[?] succeeds his father Leonidas as king of Sparta.
• August Battle of Artemisium[?] Persian fleet fights an inconclusive battle with the Greek allied fleet.
• September 23 Battle of Salamis.
• Persian invasion of Corfu.
• Battle of Himera[?] The Carthaginians under Hamilcar[?] are defeated by the Greeks of Sicily, led by Gelon of Syracuse[?].

Births

• Euripides, Greek playwright.
• Antiphon, Attic orator.
• Philolaus, Greek mathematician and philosopher (+ circa 405 BC) (estimated date).

Deaths

• Leonidas and 300 Spartans (died at Thermopylae).
• Nabu-rimanni, Chaldean astronomer and mathematician (estimated date).