LATIN DICTIONARYLexicon Latīnum
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“ruler” in Latin

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

ruler
One who rules, a governor, dominator alicujus (the governor, Cic., N.D., 2, 2, 4, dominator rerum Deus): dominus, of anybody, alicujus (unlimited master, lord; hence the pure Latin term for tyrannus): moderator: gubernator: rector. (The words are found in this connection and order.) rector et moderator (guide and governor; especially of God): tyrannus (one that has raised himself to dominion; a tyrant): princeps; imperator (as prince, emperor: ☞ of the Silver Age): feminine, quae imperio regit; dominatrix, moderatrix, gubernatrix. The sovereign or universal RULER, regnator omnium; cujus numini parent omnia (of God; regnator omnium Deus, cetera subjecta et parentia; Tac., Germ., 39, 5).
An instrument for ruling with; Vid. SULE, s.

Quick answer

What is the Latin word for ruler?
The usual Latin words for “ruler” are dominus, moderor, gubernātor; also rēctor, tyrannus, prī̆nceps. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.