Treaty of Marienburg

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The treaty of Marienburg, concluded on 29 June 1656, was a Brandenburg-Prussian – Swedish alliance during the Second Northern War.Frost (2000), p. 173

In January 1656, Charles X Gustav of Sweden made Frederick William I, Elector of Brandenburg, his vassal for the Duchy of Prussia.Frost (2000), p. 171 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. While the latter was to remain a Swedish vassal for Prussia, he was promised hereditary sovereignty in four voivodeshipsErdmannsdörfer (ADB), p. 485 of Greater Poland in return for participating in the Charles X Gustav's Polish campaigns. 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.Frost (2000), p. 178

Sources References

Bibliography

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

External links Scan of the treaty of Marienburg at ieg-mainz.de (Institut für Europäische Geschichte Mainz), 18 pages