A ruler in a duarchy; one of two people who jointly hold supreme power or authority over a state or territory.
From duo- (two) + -arch (from Greek arkhein, to rule). This formation parallels monarchy (one ruler) and anarchy (no ruler), following a productive Greek-derived naming pattern for systems of government.
Ancient Rome famously had two consuls (duarchs) leading simultaneously—a brilliant system where each could veto the other's power grab, preventing tyranny; modern nations still haven't figured out what Rome knew 2,000 years ago.
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