grand duke ( synonym found)
Definition of grand duke:

(n) : ruler or monarch of a grand duchy; son or grandson of a czar (emperor) of the Russian Empire. (A more literal translation of the Russian would be "grand prince".)
Definition of grand duke:

(n) : ruler or monarch of a grand duchy; son or grandson of a czar (emperor) of the Russian Empire. (A more literal translation of the Russian would be "grand prince".)
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