Tczew (Trsow, Dersowe, ‘weaver's town’[1]) was first mentioned as Trsow in a document by Pomeranian Duke Grzymisław bestowing the land to the Knights Hospitaller in 1198.[3] Around 1200 Sambor I, Duke of Pomerania, built a fortress here.[2] In some documents, the name Derszewo appears, which stems from the name of a feudal lord, Dersław.