2. Under the Roman republic, the title emperor was the generic name given to the commanders-in-chief in the armies. But even then the application of the word was restrained to the successful commander, who was declared emperor by the acclamations of the army, and was afterwards honored with the title by a decree of the senate. 3. It, is now used to designate some sovereign prince who bears this title. Ayl. Pand. tit. 23.