THE DATE BEHIND THE NAME
Siemowit III, Duke of Masovia
Polish nobleman
Siemowit III, Duke of Masovia was born in 1314 and died on June 16, 1381.
Born
in 1314
Died: June 16, 1381
Source:
No external source identified
Synchronized from Wikidata on October 5, 2026.
- Citizenship
- Poland
More about Siemowit III, Duke of Masovia
Family
- Father
- Trojden I, Duke of Masovia
- Sibling
- Bolesław Jerzy of Mazovia
- Child
- Siemowit IV
- Sibling
- Casimir of Masovia
- Child
- Janusz I of Warsaw
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 III, Duke of Masovia die?
Siemowit III, Duke of Masovia died on June 16, 1381.