Leonidas I was a king of the Greek city-state of Sparta, and the 17th of the Agiad line, a dynasty which claimed descent from the mythical demigod Heracles. Leonidas I was a son of King Anaxandridas II. He succeeded his half-brother King Cleomenes... Wikipedia
Born: Sparta
Died: 480 BC, Thermopylae, Greece
Grandparent: Leon of Sparta
Great-grandparent: Eurycratides
Nephews: Pausanias the Regent, Euryanax, and Nicomedes of Sparta
Niece: Gorgo, Queen of Sparta
Children: Pleistarchus