Leonidas I

~540–480 BCE · Greek (Sparta) · Greco-Persian Wars

Known for: Led 300 Spartans at Thermopylae against the Persian invasion—history's most iconic last stand

Leonidas I was the Spartan king who led 300 elite warriors and several thousand Greek allies to hold the pass at Thermopylae against Xerxes' invasion force of perhaps 100,000–300,000 Persians in 480 BCE. Raised through the brutal agoge system from age seven, he embodied every Spartan virtue: physical toughness, emotional stoicism, and absolute devotion to duty.

When a traitor revealed a mountain path that allowed the Persians to encircle his position, Leonidas dismissed most of the allied forces and stayed with his 300 Spartans, 700 Thespians, and 400 Thebans to fight to the death. His sacrifice bought time for the Greek fleet to regroup and ultimately defeat Persia at Salamis, preserving Western civilization in its infancy.

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