Jan Muskata
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Jan Muskata(1250-1320) was a bishop of Kraków. He became bishop in 1294. He had supported Premislas II of Poland, but after his assassination he joined the side of Venceslaus II of Bohemia. He served as his vice-chancellor in 1301 and also worked with his son.
He might be best known for his strong opposition to Władysław I the Elbow-high who he excommunicated. In response Władysław had him imprisoned, which led Jan to appeal to the Pope. He also had a hostile relationship to Archbishop Jakub Świnka.