THE DATE BEHIND THE NAME
Siemowit IV
Duke of Masovia
Siemowit IV was born in 1352 and died on January 21, 1426.
Born
in 1352
Died: January 21, 1426
Source:
No external source identified
Synchronized from Wikidata on October 5, 2026.
Original calendar: Julian. This broad date cannot be represented as a single Gregorian date; the original value is shown.
- Professions
- aristocrat
More about Siemowit IV
Family
- Child
- Siemowit V of Masovia
- Sibling
- Janusz I of Warsaw
- Child
- Trojden II of Płock
- Child
- Cymburgis of Masovia
- Child
- Aleksander Mazowiecki
- Father
- Siemowit III, Duke of Masovia
- Spouse
- Alexandra of Lithuania
- Child
- Maria of Masovia
- Child
- Władysław I of Masovia
All birth date sources
A source is P248 “stated in” or a non-Wikimedia reference URL. Import-only references do not qualify.
No external source identified
Synchronized from Wikidata on October 5, 2026. View Wikidata record
Questions people ask
When did Siemowit IV die?
Siemowit IV died on January 21, 1426.