Category:John IV, Duke of Oświęcim

**Jan IV of Oświęcim**
	Duke of Oświęcim and Karniów
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Date of birth	1420s
Date of death	28 October 1495 (statement with Gregorian date earlier than 1584)
Country of citizenship	Kingdom of Poland;
Occupation	feudatory;
Family	Piast dynasty; Piasts of Teschen;
Father	Casimir I of Oświęcim;
Mother	Anna żagańska;
Sibling	Przemysław of Toszek; Wenceslaus I of Zator;
Child	Helena of Oświęcim;
Authority file
	Q480721;
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