[1] It existed during the High Middle Ages era, from 1313 to 1370,[1][2] and from 1381 to 1442.

[3][4] The state was established in April 1313, in the partition of the Duchy of Płock, with duke Siemowit II of Masovia becoming its first leader.

[1] It existed until 5 November 1370, when, under the rule of duke Siemowit III, duchies of Czersk, Rawa, and Warsaw were unified into the Duchy of Masovia.

[2][5] It was again reestablished in June 1381, in the partition of the Duchy of Masovia, with duke Siemowit IV as its first leader.

[3][6][7] It existed until 1488, when it got incorporated into the Duchy of Czersk.