The Theban–Spartan War of 378–362 BC was a series of military conflicts fought between Sparta and Thebes for hegemony over Greece. In 378 BC, led by General Epaminondas, Thebes revolted against its Spartan garrison and successfully repelled Spartan offensives. A clever tactician, Epaminondas crushed the hitherto invincible Spartan army at Leuctra in 371 BC, therefore ending Sparta's hegemony and starting Thebes' own hegemony over Greece. After Leuctra, the war continued in the Peloponnese, where Sparta was fighting for survival. In 362 BC, the Battle of Mantinea was a new victory for Thebes, but Epaminondas was also killed. The conflict ended soon after with a treaty of general peace signed by all the belligerents, except Sparta, which was by now isolated and permanently weakened.
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Theban-Spartan War in the context of Helots
The helots (/ˈhɛləts, ˈhiːləts/; Greek: εἵλωτες, heílotes) were a subjugated group that constituted a majority of the population of Laconia and Messenia – the territories ruled by Sparta in Ancient Greece. There has been controversy since antiquity as to their exact characteristics, such as whether they constituted an Ancient Greek tribe, a social class, or both. For example, Critias described helots as "slaves to the utmost", whereas according to Pollux, they occupied a status "between free men and slaves". Tied to the land, they primarily worked in agriculture as a majority and economically supported the Spartan citizens.
The proportion of helots in relation to Spartan citizens varied throughout the history of the Spartan state; according to Herodotus, there were seven helots for each of the 5,000 Spartan soldiers at the time of the Battle of Plataea in 479 BC. Thus the need to keep the helot population in check and to prevent rebellion were major concerns of the Spartans. Helots were ritually mistreated and humiliated. Every autumn the Spartan polis declared war on the helots, allowing them to be killed and abused by members of the Crypteia without fear of religious repercussion. Uprisings and attempts to improve the lot of the helots did occur, such as the conspiracy of Cinadon of 399 BC. Plato on the other hand does not mention the killings by the Crypteia at all in Laws. The population was largely liberated by the Theban commander Epaminondas following the Theban-Spartan War.