Stephenson Family Tree » Janusz I Piast Mazowiecki Prince of Ciechanow and Warsaw (± 1346-1429)

Personal data Janusz I Piast Mazowiecki Prince of Ciechanow and Warsaw 


Household of Janusz I Piast Mazowiecki Prince of Ciechanow and Warsaw

He is married to Danuta Anna Princess of Lithuania.

They got married on November 23, 1371.

Do you have supplementary information, corrections or questions with regards to Janusz I Piast Mazowiecki Prince of Ciechanow and Warsaw?
The author of this publication would love to hear from you!


Timeline Janusz I Piast Mazowiecki Prince of Ciechanow and Warsaw

  This functionality is only available in Javascript supporting browsers.
Click on the names for more info. Symbols used: grootouders grandparents   ouders parents   broers-zussen brothers/sisters   kinderen children

Ancestors (and descendant) of Janusz I Piast Mazowiecki


With Quick Search you can search by name, first name followed by a last name. You type in a few letters (at least 3) and a list of personal names within this publication will immediately appear. The more characters you enter the more specific the results. Click on a person's name to go to that person's page.

  • You can enter text in lowercase or uppercase.
  • If you are not sure about the first name or exact spelling, you can use an asterisk (*). Example: "*ornelis de b*r" finds both "cornelis de boer" and "kornelis de buur".
  • It is not possible to enter charachters outside the standard alphabet (so no diacritic characters like ö and é).

The data shown has no sources.

Historical events

Day of marriage November 23, 1371

Day of death December 8, 1429

  • Gravin Jacoba (Beiers Huis) was from 1417 till 1433 sovereign of the Netherlands (also known as Graafschap Holland)
  • In the year 1429: Source: Wikipedia
    • May 8 » Joan of Arc lifts the Siege of Orléans, turning the tide of the Hundred Years' War.
    • June 11 » Hundred Years' War: Start of the Battle of Jargeau.
    • June 12 » Hundred Years' War: On the second day of the Battle of Jargeau, Joan of Arc leads the French army in their capture of the city and the English commander, William de la Pole, 1st Duke of Suffolk.
    • June 18 » French forces under the leadership of Joan of Arc defeat the main English army under Sir John Fastolf at the Battle of Patay. This turns the tide of the Hundred Years' War.
    • November 4 » Armagnac–Burgundian Civil War: Joan of Arc liberates Saint-Pierre-le-Moûtier.
    • November 24 » Hundred Years' War: Joan of Arc unsuccessfully besieges La Charité.


Same birth/death day

Source: Wikipedia


About the surname Piast Mazowiecki


The Stephenson Family Tree publication was prepared by .contact the author
When copying data from this family tree, please include a reference to the origin:
Brian K. Stephenson , "Stephenson Family Tree", database, Genealogy Online (https://www.genealogieonline.nl/stephenson-family-tree/I89589.php : accessed May 4, 2025), "Janusz I Piast Mazowiecki Prince of Ciechanow and Warsaw (± 1346-1429)".