"The Latin word imperator derives from the stem of the verb imperare, meaning ´to order, to command´. It was originally employed as a title roughly equivalent to commander under the Roman Republic. Later it became a part of the titulature of the Roman Emperors as part of their cognomen. The English word emperor derives from imperator via Old French: Empereür. The Roman emperors themselves generally based their authority on multiple titles and positions, rather than preferring any single title. Nevertheless, imperator was used relatively consistently as an element of a Roman ruler´s title throughout the principate and the dominate. In Latin, the feminine form of imperator is imperatrix." - (en.wikipedia.org 30.11.2019)
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