Czersk Land

With its capital in the town of Czersk, it belonged to the Masovian Voivodeship.

The history of Czersk Land as a separate administrative unit dates back to 1245, when Duke Konrad I of Masovia moved the seat of the castellany from Grójec to Czersk, making Czersk the major urban and political center of southern Mazovia.

In 1377, Siemowit III, Duke of Masovia called a council in Sochaczew, during which he disbanded castellanies, and following the example of the Kingdom of Poland, created ten lands, all divided into counties.

It stretched from Mińsk Mazowiecki to Grojec, along both banks of the Vistula, including the town of Garwolin.

In 1526, Czersk Land was annexed into Poland, continuing to exist as a separate administrative unit within Mazovian Voivodeship, with local sejmiks taking place at Czersk, and two envoys sent to the Sejm in Warsaw.