Answer: emps

AnswerCrossword Clue
EMPSPersian and Byzantine: Abbr.
EMPSCaligula and Napoleon: Abbr.
EMPSNero and Napoleon, briefly
EMPSNapoleon I and III, e.g.
EMPSLittle Caesars? (Abbr.)
EMPSJap. rulers
EMPSNap. and Cath. II
EMPSVict. or Cath. II
EMPSNapoleons I and III: Abbr.
EMPSVictoria and Catherine II: Abbr.
EMPSNero and Napoleon (abbr.)
EMPSNapoleon et al.: Abbr.
EMPSNapoleon and Jones: Abbr.
EMPSMonarchs: Abbr.
EMPSRegal titles: Abbr.
EMPSSovereigns: Abbr.
EMPSKingdoms: Abbr.
EMPSRulers: Abbr.
EMPSRoyal ruler: Abbr.
EMPSRoyals: Abbr.