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Diarchy

Form of government with dual co-rule Kings of the Visigoths (c. 1641) by Alonso Cano Diarchy (from Greek δι-, di-, "double", and -αρχία, -arkhía, "ruled"), duarchy, or duumvirate is a form of government characterized by co-rule, with two people ruling a polity together either lawfully or de facto, by collusion and force.

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