Category:Janusz I, Duke of Warsaw

**Janusz I of Warsaw**
	Polish noble
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Date of birth	1346 (statement with Gregorian date earlier than 1584)
Date of death	8 December 1429; Czersk, Czersk
Place of burial	St. John's Archcathedral;
Country of citizenship	Poland;
Occupation	aristocrat;
Noble title	duke;
Family	Piast dynasty;
Father	Siemowit III, Duke of Masovia;
Sibling	Siemowit IV; Henry of Masovia; Euphemia of Masovia; Margaret of Masovia;
Child	Janusz the Younger; Bolesław Januszowic; Konrad Januszowic;
Spouse	Danutė of Lithuania;
Authority file
	Q2975528;
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