imperator

noun1

1. •
   An emperor.

   • Modern emperors and consuls of the year VIII. are no more the imperatores of ancient Rome, and modern religious organizations are but the phantasms of mediaeval corporations. — 1898

noun1

1. •
   (formal) The reigning emperor; Male equivalent of Imperatrix

   • He [w:Trajan] was careful to distinguish and reward merit, and raised men of family, and the kindred of former Imperators, into situations of prominence or command. — 1850