King Leonidas I, King of Sparta

Leonidas I was a king of the city-state of Sparta from about 490 B.C. until his death at the Battle of Thermopylae against the Persian army in 480 B.C. Although Leonidas lost the battle, his death at Thermopylae was seen as a heroic sacrifice because he sent most of his army away when he realized that the Persians had outmaneuvered him. Three hundred of his fellow Spartans stayed with him to fight and die. Almost everything that is known about Leonidas comes from the work of the Greek historian Herodotus.

As king, Leonidas was a military leader as well as a political one. Like all male Spartan citizens, Leonidas had been trained mentally and physically since childhood in preparation to become a hoplite warrior. Hoplites were armed with a round shield, spear and iron short sword. In battle, they used a formation called a phalanx, in which rows of hoplites stood directly next to each other so that their shields overlapped with one another. During a frontal attack, this wall of shields provided significant protection to the warriors behind it. If the phalanx broke or if the enemy attacked from the side or the rear, however, the formation became vulnerable. It was this fatal weakness to the otherwise formidable phalanx formation that proved to be Leonidas’ undoing against an invading Persian army at the Battle of Thermopylae in 480 B.C.