A historical social or political system in ancient Greece where elite warriors or nobles formed close-knit military groups with loyalty bonds between members.
From Greek hetairos (companion, comrade) + -ism (doctrine or practice). The term originally referred to the companionship bonds in ancient Spartan military brotherhoods, later generalized to describe the practice or ideology of such elite groups.
Hetairism reveals how the ancient Greeks formalized friendship into political power—the most famous hetairoi were the Sacred Band of Thebes, 150 pairs of lovers who fought as an undefeated unit until their defeat at Chaeronea. This shows how deeply personal relationships shaped military strategy and political structure in the ancient world.
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