One of two co-rulers or joint magistrates in ancient Rome, or one of two people jointly holding equal office.
From Latin 'duumvir,' literally 'two men' (duo + vir = man). In ancient Rome, duumvirs were elected officials who shared executive authority, like early co-presidents.
The Romans tried the 'two heads are better than one' approach to government—duumvirs and the later triumvirs show they really believed in shared power structures!
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