A ruler or leader of a group of ten, or a division or region governed by ten people; a variant of decarch.
From Greek deca- (ten) + -arch (ruler). Used in ancient texts to describe leadership structures based on the number ten, reflecting Greek interest in numerical organization.
Ancient societies loved organizing by tens—the Spartans had decarchs, and even today we use 'decade' and 'decimal'—the number ten seems magical to human organization!
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