Augustus (ôgŭsˈtəs, əgŭsˈ–) [key], 63 B.C.–A.D. 14, first Roman emperor, a grandson of the sister of Julius Caesar. Named at first Caius Octavius, he became on adoption by the Julian gens (44 B.C.) Caius Julius Caesar Octavianus (Octavian); Augustus was a title of honor granted (27 B.C.) by the senate.

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