Siemowit I of Masovia (Polish: Siemowit (Ziemowit) I mazowiecki) (d. 23 June 1262), was a Polish prince member of the House of Piast, Duke of Czersk during...

Siemowit of Masovia may refer to these Masovian dukes: Siemowit I of Masovia (1224–1262), son of Konrad I of Masovia and his wife Agafia Siemowit II of...

Konrad I of Masovia (ca. 1187/88 – 31 August 1247), from the Polish Piast dynasty, was the sixth Duke of Masovia and Kuyavia from 1194 until his death...

as a result of the partition of Masovia between him and his older brother Janusz I after the death of their father on 16 June 1381, Siemowit IV finally...

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...

Bolesław II died in 1313, the Duchy of Masovia was divided. As the oldest son, Siemowit II obtained the central part of Masovia, with Rawa Mazowiecka as his...

(1429–1454) Siemowit IV, Duke at Rawa and Płock (until 1426), also Duke of Belz from 1388 Since the Polish-Lithuanian Union of 1385, Masovia was localized...

the eldest son of Siemowit IV, Duke of Masovia and Alexandra of Lithuania, daughter of Algirdas. He spent his early years at the court of King Władysław...

Bolesław I of Masovia (Polish: Bolesław I Mazowiecki; 1208 – ca. 25 February 1248), was Polish prince member of the Polish House of Piast, Duke of Sandomierz...

sons the districts of Warsaw and Czersk. Also High duke of Poland twice (1288, 1289). He was younger son of Siemowit I of Masovia and Pereyaslava, a Rus'...

1275 sole ruler over Czersk and Duke of Sandomierz during 1289. He was the eldest son of Siemowit I of Masovia and Pereyaslava, a Russian princess. Konrad...

Duke of Pomerania and then to Henry VII of Brzeg. She was a member of the House of Piast. Margaret was a daughter of Siemowit III of Masovia and his...

the residents of Warsaw. Pułtusk is one of the oldest townships in Poland, having received city rights from Duke Siemowit I of Masovia in 1257. Throughout...

January 1374), married Casimir I, Duke of Cieszyn. Siemowit III (1316/25 – 16 June 1381), Duke of Masovia. Casimir I (1329/31 – 26 November/5 December...

Siemowit I of Masovia (c. 1213–24 June 1262), succeeded eldest brother as Duke of Mazovia (1248–1262) Eudoxia (1215–1240) – The wife of Count Breny I...

Janusz of Masovia might refer to these dukes: Janusz I of Warsaw (ca. 1347/1352 – 1429), son of Siemowit III Janusz II of Masovia (1455–1495), son of Bolesław...

Duke of Pomerania. Among the princes who participated were his brother Przemysł I, Casimir I of Kuyavia, Siemowit I of Masovia, Władysław of Opole and...

head of the family". Nicknames: Ziemko, Ziemek. Siemowit, Ziemowit, one of the four legendary Piast princes of Poland Siemowit I of Masovia, a Duke of Czersk...

crowned. During the interregnum, Siemowit IV, Duke of Masovia, became a candidate for the Polish throne. The nobility of Greater Poland favored him and...

vassal of the Polish Kingdom since 1391 for the fief of Podlachia (only during his lifetime). He was the eldest son of Siemowit III, Duke of Masovia and...

Siemowit of Cieszyn (Polish: Siemowit cieszyński) (c. 1340 – 25 September 1391) was a Polish prince, member of the Piast dynasty in the Cieszyn branch...

Prince of Chełm 1264–1269 Daughters Pereyaslava († 12 April 1283), m. ca. 1248 Prince Siemowit I of Masovia Ustynia, m. 1250/1251 Prince Andrew II of Vladimir-Suzdal...

partition of the Duchy of Masovia, with duke Siemowit II of Masovia becoming its first leader. It existed until 5 November 1370, when, under the rule of duke...

According to one version of the legend, the duke or king called Kazimierz (Casimir), sometimes also identified as duke Siemowit I of Masovia, got lost in the...

canonization of St. Stanislaus. Among the princes who participated were his brother Bolesław, Casimir I of Kuyavia, Siemowit I of Masovia, Władysław of Opole...

Siemowit IV, Duke of Masovia, and they had thirteen children. On 12 December 1385, few months after the Union of Krewo, Siemowit IV, Duke of Masovia,...

funeral of their father, and was able to conquer Siemowit I's inheritance. The next geopolitical change in Masovia came in early 1248, when Bolesław I died...

Cymburgis of Masovia (Polish: Cymbarka mazowiecka; German: Cimburgis von Masowien; 1394 or 1397 – 28 September 1429), also spelled Zimburgis or Cimburga...

Prince of Lithuania 1264–1267 (1268–c. 1269), Prince of Chełm 1264–1269 Sisters Pereyaslava (born 12 April 1283), married c. 1248 Prince Siemowit I of Masovia...

their support; however, thanks to the help of a coalition formed with Bolesław V the Chaste, Siemowit I of Masovia, and Bolesław the Pious, Leszek eventually...