Sławno [ˈswavnɔ] (Kashubian: Słôwno, German: Schlawe) is a town on the Wieprza river in Middle Pomerania region, north-western Poland, with 12,511 inhabitants (2019).

[3][4] When the line became extinct about 1227, their estates were the matter of an inheritance conflict between the Griffin Duke Barnim I the Good and Swietopelk II from the Samborid dynasty, who ruled over the adjacent territories of Pomerelia (Gdańsk Pomerania) in the east.

In 1308 Brandenburg invaded the region and Waldemar of Ascania finally separated Sławno from Pomerelia, which he sold to the Teutonic Order by the 1309 Treaty of Soldin.

He nevertheless lost the town to the Griffin duke Wartislaw IV of Pomerania in 1317, whereafter Sławno remained a part of the Griffin-ruled Pomeranian duchies until 1637.

Duke Wartislaw IV enfeoffed Peter von Neuenburg of the Swienca noble family with Sławno, who granted the settlement town rights in 1317.