triumvir
Noun
Meaning
One of tree men united in public office or authority.
Source: Webster's dictionaryHypernyms
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Derivatives
Examples
Eck (2003), 16. Contemporary Roman historians provide conflicting reports as to which triumvir was more responsible for the proscriptions and killing.
Octavian forced Lepidus to resign after the older triumvir attempted to take control of Sicily after the defeat of Sextus.