Leonidas I (Greek: Λεωνίδας) was a Greek hero-king of Sparta, the 17th of the Agiad line, third son of King Anaxandridas II of Sparta, who was believed in mythology to be a descendant of Heracles, possessing much of the latter&#x27;s strength and bravery. Leonidas I is notable for his leadership at the Battle of Thermopylae. [Here: The statue of Leonidas I in Sparti]