Gorgo (/ˈɡɔːrɡoʊ/; Greek: Γοργώ [ɡorɡɔ͜ɔ́]; fl. 480 BC) was a Queen of Sparta. She was the daughter and the only known child of Cleomenes I, King of Sparta (r. 520–490 BC) during the 6th and 5th centuries BC. She was the wife of King Leonidas I, Cleomenes' half-brother, who fought and died in the Battle of Thermopylae. Gorgo is noted as one of the few female historical figures actually named by Herodotus, and was known for her political judgement and wisdom. She is notable for being the daughter of a king of Sparta, the wife of another, and the mother of a third. Her birth date is uncertain, but is most likely to have been between 518 and 508 BC, based on Herodotus' dating (Histories 5.51).
Source: Wikipedia, "Gorgo, Queen of Sparta", available under the CC-BY-SA License.