Histories

Each city had its own general, but the one most admired and the leader of the whole army was a Lacedaemonian, Leonidas, son of Anaxandrides, son of Leon, son of Eurycratides, son of Anaxandrus, son of Eurycrates, son of Polydorus, son of Alcamenes, son of Teleclus, son of Archelaus, son of Hegesilaus, son of Doryssus, son of Leobotes, son of Echestratus, son of Agis, son of Eurysthenes, son of Aristodemus, son of Aristomachus, son of Cleodaeus, son of Hyllus, son of Heracles. Leonidas had gained the kingship at Sparta [22.4417,37.0667] (Perseus) Sparta unexpectedly.

Since he had two older brothers, Cleomenes and Dorieus, he had renounced all thought of the kingship. Cleomenes, however, died without male offspring, and Dorieus, who had met his end in Sicily [14,37.5] (region), Italy, Europe Sicily, was also no longer alive. The succession therefore fell to Leonidas since he was older than Anaxandrides' youngest son Cleombrotus and had married Cleomenes' daughter.