World Library  
Flag as Inappropriate
Email this Article

Janusz I of Masovia

Article Id: WHEBN0005713655
Reproduction Date:

Title: Janusz I of Masovia  
Author: World Heritage Encyclopedia
Language: English
Subject: Duke of Masovia, Kabaty, Battle of Grunwald (banners)
Publisher: World Heritage Encyclopedia

Janusz I of Masovia

Janusz I (c. 1347–1352[1] – 1429) was Duke of Warsaw (from 1373), 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. In 1374 he inherited Zakroczym and in 1381 the lands of Czersk, Liw and Wyszogród as the result of partition of Masovia between his younger brother Siemowit IV and himself. In 1376 he married princess Danutė (Danuta Anna), daughter of Lithuanian Duke Kęstutis. Because of his family ties, he served as a mediator between king of Poland Jogaila and the Grand Duke of Lithuania Vytautas.

In 1381 duke Janusz paid homage to new king of Poland Louis I of Hungary, and in 1386 he became a hereditary vassal of Poland. In 1391 king-consort Jagiello awarded duke Januszthe the disputed lands of Podlachia ( terram nostram Drohiczensen, Melnyk, Surasz, Byelsko ac omnibus villis in eisdem districtubus) for life of duke Janusz. In 1406 he moved the capital of Masovia from Czersk to newly developing strategic town of Warsaw and actively worked to develop his towns, fortified his castles and strongholds. In 1409 he fielded a banner of cavalry to aid his liege, the king of Poland, in the war against the Teutonic Order. The following year together with his banner, despite his age, he took part in the Battle of Grunwald. His banner had in its badge a quartered field,intwo quarters a white eagle in a red field and the other two quarters had a winged dragon( or a basilisk) in a white field.[2]


With Danuta, he fathered three sons:

  • Janusz Młodszy (Janusz the Younger)
  • Bolesław Januszowic
  • Konrad Januszowic.

He outlived them all, and passed, by testament, his duchy to his grandson, son of Bolesław Januszowic, known as Bolesław IV of Warsaw.

This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.

Copyright © World Library Foundation. All rights reserved. eBooks from World eBook Library are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.