Would a duke hypothetically be subservient to a Tsar? Given the above question, please answer with reasoning first!

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
The Tsar was the highest ruler in several eastern countries. A duke was a title given to important european nobles. Dukes ranked below princes, kings, and queens. Tsars were the equivalents of English Kings.
Therefore, the answer is yes.