Related Clues:

• "Revenge of the ___" ("Star Wars" film)
• Persia, e.g., once
• Ottoman, for one
• Jedi foes, in 'Star Wars'
• Magnate's holdings
• Old Rome, e.g.
• Vast dominion
• Jedi nemesis
• Villainous group in the 'Star Wars' universe
• "Star Wars" villains
• Number of countries ruled by one
• Domain ruled by an emperor or empress
• Group of countries under a single authority
• Group of countries under single authority
• Large group of states