History and Etymology
Middle English
emperice, emperes (with assimilation of the suffix to
-esse -ess), borrowed from Anglo-French
emperice, empereis, going back to Late Latin
imperātrīc-, imperātrīx (Latin, "female general [used ironically]"), from Latin
imperāre "to give orders, exercise authority, hold political power" +
-trīc-, -trīx, feminine agent suffix — more at
emperor