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Janusz I of Warsaw (pl: Janusz I warszawski ), also known as Janusz I the Old (pl: Janusz I Starszy) (c. 1347/52 [1] – 8 December 1429), was a Polish prince member of the House of Piast in the Masovian branch, from 1373/74 Duke of Warsaw and after the division of the paternal inheritance between him and his brother in 1381, ruler over Nur, Łomża...
It existed until 5 November 1370, when, under the rule of duke Siemowit III, duchies of Czersk, Rawa, and Warsaw were unified into the Duchy of Masovia. It was again re-established in June 1381, in the partition of the Duchy of Masovia, with duke Janusz I of Warsaw as its first leader.
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Janusz I of Warsaw (pl: Janusz I warszawski ), also known as Janusz I the Old (pl: Janusz I Starszy) (c. 1347/52 – 8 December 1429), was a Polish prince member of the House of Piast in the Masovian branch, from 1373/74 Duke of Warsaw and after the division of the paternal inheritance between him and his brother in 1381, ruler over Nur, Łomża, Li...
The appearance and importance of Warsaw are significantly changed under Janusz I the Older (1373/1374 - 1429), who as a builder of towns and numerous castles was compared to the King of Poland Casimir III the Great (1333 -1370).
In the 1890s he studied in the Flying University. During the years 1898–1904 Korczak studied medicine at the University of Warsaw [4] and also wrote for several Polish language newspapers. After graduation, he became a pediatrician. In 1905−1912 Korczak worked at Bersohns and Baumans Children's Hospital in Warsaw.
- c. 7 August 1942 (aged 64), Treblinka extermination camp, German-occupied Poland
Who was Janusz I of Warsaw? Janusz I was Duke of Warsaw, one of the dukes of Masovia after its division amongst the sons of Duke Siemowit III known as Janusz I the Elder. Among the lands in his domain were the areas of Warsaw, Nur, Łomża, Ciechanów and Różan.
After his father’s death (16 June 1381), Janusz I ruled the province consisting of Eastern Mazovia, i.e. the lands of Czersk, Warsaw (with later Łomża and Nur), Liw, Wyszogród, Zakroczym (with later Różan) and Ciechanów8.
