Triarchies

A triumvirate () or a triarchy is a political institution ruled or dominated by three individuals, known as triumvirs (). The arrangement can be formal or informal. Though the three leaders in a triumvirate are notionally equal, the actual distribution of power may vary.

alliance between Roman politicians Caesar, Pompey and Crassus

Roman political alliance (43–32 BC)

organization

triumvirate ruling the Ottoman Empire during World War I

short-lived Netherlands provisional government