Leonidas I was a king of Sparta who commanded the Greek force defending the pass of Thermopylae during Xerxes’s invasion in 480 BC. After the Persian army found a route around the position, Leonidas dismissed much of the allied force and remained with Spartans, Thespians and others in a final defence.
He was killed, and Persian troops mutilated his body. The defeat became a lasting symbol of sacrifice and resistance. Leonidas I held the title of king and king of Sparta. Leonidas I belonged to Agiads.
Steven Pressfield’s Gates of Fire makes Leonidas I the commander whose decision to hold Thermopylae gives meaning to the training, loyalties and sacrifice of the Spartan royal guard. Valerio Massimo Manfredi’s Spartan places Leonidas and Thermopylae within a broader story about Spartan citizenship, Helot oppression and the Persian invasion. Captivating History’s The Battle of Thermopylae reconstructs Leonidas’s stand against Xerxes and separates the strategic evidence from later legend. Michael Livingston’s The Killing Ground treats Thermopylae as one battle in a landscape repeatedly fought over, explaining how terrain shaped Leonidas’s tactical position. Adrian Goldsworthy’s Athens and Sparta places his kingship and death within the wider rivalry, institutions and military culture of the two leading Greek poleis.