The Spartans (documentary) the Spartan constitution into the militarised state we know of today. Homosexuality among men and boys was mandatory. The training of Spartan youths is explained, from their enrollment in the Agoge system right through to their attainment of citizenship. The class structure of the Lacedaemonian state (Helots, Perioeci, and the soldier-citizens themselves) is also covered. The episode ends with the battle of Thermopylae, in which 300 Spartans, including their king, Leonidas, were killed in action defending Greece from a Persian invasion. Part 2 opens with the retreat of the Persians, after Thermopylae and the battle of Salamis. Athens, which had
Battle of Thermopylae to the battle, the Hellenes remembered the Dorians, an ethnic distinction which applied to the Spartans, as the conquerors and displacers of the Ionians in the Peloponnesus. After the battle, Spartan culture became an inspiration and object of emulation, a phenomenon known as Laconophilia. There are several analogous battles. Similarities between the Battle of Thermopylae and the Battle of Persian Gate have been recognized by both ancient and modern authors, which describe it as a kind of reversal of the Battle of Thermopylae, calling it "the Persian Thermopylae". Here, on Alexander the Great's campaign against Persia in 330 BC to