<p><strong>Noun</strong></p><ul><li>Ga·ius [gey, -uhs] (or Ca·ius) [key, -uhs]: Julius, c. 100–44 B.C., Roman general, statesman, and historian.</li><li>Sidney, Sid (1922–2014): U.S. comedian.</li><li>A title of the Roman emperors from Augustus to Hadrian, and later of the heirs presumptive.</li><li>Any emperor.</li><li>A tyrant or dictator.</li><li>Any temporal ruler, in contrast with God; the civil authority.</li><li>A male given name: from a Roman family name.</li></ul>