TRIUMVIR
triumvir
(noun) one of a group of three sharing public administration or civil authority especially in ancient Rome
Source: WordNet® 3.1
Etymology
Noun
triumvir (plural triumviri or triumvirs)
One member of a triumvirate
Source: Wiktionary
Tri*um"vir, n.; pl. L. Triumviri, E. Triumvirs. Etym: [L., fr. res,
gen. trium, three + vir a man. See Three, and Virile.] (Rom. Antiq.)
Definition: One of tree men united in public office or authority.
Note: In later times the triumvirs of Rome were three men who jointly
exercised sovereign power. Julius Cæsar, Crassus, and Pompey were the
first triumvirs; Octavianus (Augustus), Antony, and Lepidus were the
second and last.
Source: Webster’s Unabridged Dictionary 1913 Edition