Prince Michal Vishnevetsky is initially a Vassal of Polish Commonwealth. He has no fixed fiefs at the start.
He is based on a real person, Michał Korybut Wiśniowiecki (1640–1673), who was a Ruthenian-Polish noble, one of the most powerful people in the Commonwealth, who was later crowned as the King of Poland.
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Wikipedia has an article on this subject at: Michał Korybut Wiśniowiecki |