An absolute ruler with infinite power.
A title borne by some such monarchs, as in Byzantium and tsarist Russia.
Until the 20th century, a favorable description of a ruler who was connected with the concept of lack of conflicts of interest and an indication of grandeur and power.
A ruler with absolute power; a tyrant.
A title awarded to senior members of the imperial family in the late Byzantine Empire, and claimed by various independent or semi-autonomous rulers in the Balkans (12th to 15th centuries)