World Civilizations help please?

i have to do a crossword for homework and i found all of the answers except one and i cant find it in my text book so can someone please..?

the question is this; what is a ruler that has unlimited power and authority over his or her people?

any idea please help =)
oops i forgot to put how many letters it was. it is 15 letters and starts with an a but i cant find it in my textbook.
 
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