Marienwerder (district)

Landkreis Marienwerder was a Kreis, or district, of Prussia from 1752-1945. Its capital was Marienwerder (Kwidzyn).

King Frederick the Great of Prussia created Kreis Marienwerder as one of ten districts in an administrative reorganization of East Prussia (the former Duchy of Prussia) in 1752. After the king annexed most of Polish Royal Prussia in the 1772 First Partition of Poland, Marienwerder became a seat of government of the newly created Province of West Prussia in 1773.

After the Napoleonic Wars, Kreis Marienwerder was included within Marienwerder Region in West Prussia on 1 April 1816. This government region consisted of territory east and west of the Vistula River.

In 1818, the new Rosenberg in West Prussia and the town of Rosenberg (Susz) were detached from Kreis Marienwerder. The older district was compensated with a few communities to the west of the Vistula.

As a result of World War I, the Treaty of Versailles allocated most of West Prussia to the Second Polish Republic (as the Polish Corridor) or the independent Free City of Danzig. On 10 January 1920, all of Kreis Marienwerder's territory west of the Vistula became part of Poland. The territory east of the river was first administered by the governor of the Region of Königsberg.

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