Term: Tsar, Description: title given to a male monarch in Russia, Bulgaria and Serbia, Question: Would a duke hypothetically be subservient to a Tsar?, Answer:Yes
Fact1: The Tsar was the highest ruler in several eastern countries. Fact2: A duke was a title given to important european nobles. Fact3: Dukes ranked below princes, kings, and queens. Fact4: Tsars were the equivalents of English Kings. 