Leonidas I
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Leonidas I was a king of the ancient Greek city-state of Sparta who ruled from around 489 BC until 480 BC. He is historically significant because he led Spartan forces during this period, a time when Greece faced major challenges from external powers.
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Leonidas I (/liəˈnaɪdəs, -dæs/; Ancient Greek: Λεωνίδας, Leōnídas; born c. 540 BC; died 11 August 480 BC) was king of the Ancient Greek city-state of Sparta. He was the son of king Anaxandridas II and the 17th king of the Agiad dynasty, a Spartan royal house which claimed descent from Heracles. Leonidas I ascended to the throne in c. 489 BC, succeeding his half-brother king Cleomenes I. He ruled jointly along with king Leotychidas II until his death in 480 BC, when he was succeeded by his son, Pleistarchus.
At the Second Greco-Persian War, Leonidas led the allied Greek forces in a last stand at the Battle of Thermopylae (480 BC), attempting to defend the pass from the invading Persian army, and was killed early during the third and last day of the battle. Leonidas entered myth as a hero and the leader of the 300 Spartans who died in battle at Thermopylae. While the Greeks lost this battle, they were able to expel the Persian invaders in the following year.