Back Siemowit III. German Σιεμόβιτ Γ΄ της Μαζοβίας Greek Siemovit III de Mazovie French Siemowit III ID Siemowit III di Masovia Italian Ziemovit III van Mazovië Dutch Siemowit III Polish Земовит III Russian Земовит III Ukrainian 謝莫維特三世 Chinese
Siemowit III | |
|---|---|
| Duke of Masovia | |
 Princely seal of Siemowit III; 1371 | |
| Born | c. 1320 |
| Died | 16 June 1381 |
| Buried | Plock cathedral |
| Noble family | Piast |
| Spouse(s) | Euphemia of Opava Anna of Ziębice |
| Issue | Euphemia Anna Janusz I of Warsaw Margaret Siemowit IV of Masovia Henry of Masovia |
| Father | Trojden I of Masovia |
| Mother | Maria of Galicia |
Siemowit III of Masovia (alternatively Ziemowit III; c. 1320 – 1381) was a prince of Masovia and a co-regent (with his brother Casimir I of Warsaw) of the lands of Warsaw, Czersk, Rawa, Gostynin and other parts of Masovia.
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