In Pair of Kings the crown of Kinkow fell on twin brothers whose order of birth was never clearly accounted for; thus they reign as a duumvirate.
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The First Whitlam Ministry in Australia is sometimes called the "Duumvirate" because it consisted entirely of the Prime Minister, Gough Whitlam, and his deputy, Lance Barnard, who between them split up all ministerial and quasi-ministerial positions for two weeks in December 1972.
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Some political parties have duumvirates, sometimes, such as is the case of Lindsey German and John Rees in the Socialist Workers Party in Britain.
Joining CIMA, Don Fuji, and the Muscle Outlaw'z of Naruki Doi and Masato Yoshino, he competed on the two-night Dynamite Duumvirate Tag Team Title Tournament event for Pro Wrestling Guerrilla at the Burbank National Guard Armory in Burbank, California.