Treaty of Marienburg

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Treaty of Marienburg
Type offensive alliance
Signed 29 June 1656
Location Marienburg (Malbork) castle
Signatories Charles X Gustav of Sweden
Frederick William I of Brandenburg
Parties Swedish Empire
House of Hohenzollern
Language Latin

The treaty of Marienburg, concluded on 29 June 1656, was a Brandenburg-PrussianSwedish alliance during the Second Northern War.[1]

In January 1656, Charles X Gustav of Sweden had made Frederick William I, Elector of Brandenburg, his vassal for the Duchy of Prussia.[2] By the time of the treaty of Marienburg, Swedish prospect in the war had diminished, and Charles X Gustav was willing to offer Frederick William I a reward for fighting on his side.[1] While the latter was to remain a Swedish vassal for Prussia, he was promised hereditary sovereignty in four voivodeships[3] of Greater Poland in return for participating in the Charles X Gustav's Polish campaigns.[1] This alliance proved victorious in the subsequent Battle of Warsaw, but as further campaigns stalled, Frederick William I was to gain full sovereignty in Prussia by the Treaty of Labiau in November 1656.[4]



  1. ^ a b c Frost (2000), p. 173
  2. ^ Frost (2000), p. 171
  3. ^ Erdmannsdörfer (ADB), p. 485
  4. ^ Frost (2000), p. 178


  • Erdmannsdörffer, Bernhard: Friedrich Wilhelm (Kurfürst von Brandenburg), in: Allgemeine Deutsche Biographie, published by Historische Kommission bei der Bayerischen Akademie der Wissenschaften, Band 7 (1878), pp. 480–497, fulltext at de.wikisource
  • Frost, Robert I (2000). The Northern Wars. War, State and Society in Northeastern Europe 1558-1721. Harlow: Longman. ISBN 978-0-582-06429-4. 

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