Category:Siemowit VI, Duke of Płock

**Siemowit VI of Masovia**
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Date of birth	2 January 1446, 11 January 1446
Date of death	1 January 1462, 10 January 1462
Manner of death	natural causes;
Cause of death	tuberculosis;
Place of burial	Płock Cathedral;
Noble title	knyaz;
Family	Piast dynasty;
Father	Władysław I of Masovia;
Sibling	Władysław II of Masovia;
Authority file
	Q2887861;
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