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:''For the ancient Roman dual magistracy, see Duoviri''
A '''duumvirate''' is an alliance between two equally powerful political or military leaders. The term can also be used to describe a state with two different military leaders who both declare themselves to be the sole leader of the state.
The tiny European nation of Andorra is technically a duumvirate, as it is ruled by two co-princes (one of whom is the President of France), although the Andorran prime minister actually wields power as the head of government. Duumvirates in history include the city-states of Carthage, ruled by two mayors, and ancient Rome, ruled by two Consuls.
In the fictional Middle-earth legendarium of author J.R.R. Tolkien, the Black Númenóreans' coastal city of Umbar was typically ruled by a duumvirate.
Duumvirates are rare in human history and are inherently unstable, as one of the two rulers will almost invariably seek greater power and, eventually, dominance.
Some political parties have duumvirates, sometimes, such as is the case of Lindsey German and John Rees in the Socialist Workers Party in Britain, they are sexual partners as well as both leading the party.

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See also

See also

★ Duoviri - ancient Roman magistracy of two men

★ Triumvirate - the equivalent term for three people

★ Decemvirate - the equivalent term for ten people