Czersk
Czersk was a Masovian Piast duchy on the middle Vistula around Czersk and Warsaw. Trojden I received its lands in the 1313 partition of Mazovia and ruled them in 1337.
His son Siemowit III reunited much of Mazovia and accepted Polish suzerainty in 1351. After the 1381 partition, Janusz I received Czersk and moved his residence to Warsaw in 1413. The reunited Duchy of Masovia, including Czersk, passed to Poland in 1526 when its Piast line died out.
Characters
- Bolesław II of Masovia
- Casimir I of Warsaw
- Maria of Galicia
- Siemowit I of Masovia
- Siemowit III of Masovia
- Trojden I of Masovia