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Kwidzyn is a town in northern Poland on the Liwa River, with 40,000 inhabitants.

The Teutonic Knights founded an Ordensburg castle in 1232 and a town the following year. This new settlement of Marienwerder became the seat of the Bishops of Pomesania within Prussia. The town was populated with Masurian settlers from the Duchy of Masovia. Werner von Orseln, who died in Marienburg (Malbork) in 1330, was buried in the cathedral of Marienwerder. St. Dorothea of Montau lived in Marienwerder from 1391 until her death in 1394; pilgrims would later come to pray in the town at her shrine. The rebellious Prussian Confederation was founded in Marienwerder on March 14, 1440. In 1466, the town became a Polish fief together with the remainder of the monastic state of the Teutonic Knights after their defeat in the Thirteen Years' War.

Kwidzyn contains the partially-ruined 14th century Brick Gothic Ordensburg castle of the Teutonic Order, namely the Bishops of Pomesania within the Order. Connected to the castle to the east is a large cathedral (built 1343-1384) containing the tombs of the bishops as well those of three Grand Masters of the Teutonic Knights.

The literally outstanding feature of the castle is a sewer tower which is connected to it by a bridge. The tower used to be placed at the river which has changed its course since, leaving it on dry land.