The Marienwerder Region was part of the Province of West Prussia from 1815–1829, and again 1878–1920, belonging to the Province of Prussia in the intervening years. The Marienwerder Region was then placed under an inter-Allied commission from 1920–1922 and was eventually divided, with the western districts included within the newly established Polish Republic as part of the so-called Polish Corridor. The eastern part of Marienwerder that voted to be incorporated within the Weimar Republic was named the Region of West Prussia (Regierungsbezirk Westpreußen) while it was joined to the Province of East Prussia from 1922 to 1939, after which its original name was restored until its dissolution in 1945.