- a king or other ruler with absolute, unlimited power; autocrat.
- any tyrant or oppressor.
- an honorary title applied to a Byzantine emperor, afterward to members of his family, and later to Byzantine vassal rulers and governors.
- an absolute or tyrannical ruler; autocrat or tyrant
- any person in power who acts tyrannically
- a title borne by numerous persons of rank in the later Roman, Byzantine, and Ottoman Empires
