Książę Siemowit Dobrzyński

Siemowit (Ziemowit) dobrzyński – od ok. 1287 r. samodzielny książę dobrzyński, w latach 1293-1295 w niewoli litewskiej, od 1300 lennik Wacława II, w latach 1303-1305 pozbawiony władzy, od 1306 r. dziedziczny lennik Polski. http://pl.wikipedia.org/wiki/Siemowit_dobrzy%C5%84ski

http://en.wikipedia.org/wiki/Casimir_I_of_Kuyavia

Marriages and Children

• Casimir's first marriage was to Jadwiga, whose origins are unknown. They had no children and she died in 1235.[3]
• Casimir married secondly in 1239 to Constance, daughter of Henry II the Pious and Anna of Bohemia. They had the following children:

1. Adelaide (before 7 April 1249-8 December 1291), nun
2. Leszek II the Black (1240/42-30 September 1288), Duke of the Fragmentation of Poland
3. Ziemomysł of Kuyavia (1241/45-29 October/24 December 1287), Duke of Kuyavia

• After Constance died in 1257, Casimir married in the same year, Euphrosyne, daughter of Casimir I of Opole and Viola, and they had the following children:

1. Władysław I the Elbow-high (1261-March 2, 1333), King of Poland (1320–1333)
2. Casimir (1261/62-10 June 1294), killed while in battle in Lithuania
3. Siemowit (1262/67-1309/14), Duke of Kuyavia-Brieg, married Anastasia of Galicia (daughter of Lev I of Galicia)
4. Euphemia (d.18 March 1308), married Yuri I of Galicia