Treaty of Saint-Germain-en-Laye (1679)

[6] In support of Louis XIV of France, Charles XI of Sweden invaded Brandenburg in 1674, but was decisively defeated in the Battle of Fehrbellin in 1675.

[5] After the Treaties of Nijmegen (1678/1679) had ended the Franco-Dutch War, France was able to support Sweden again,[5] and invaded the Brandenburgian Duchy of Cleves on the lower Rhine.

[9] Brandenburg, short of troops in the area and deprived of allies by the Nijmegen treaties, had no choice than to settle for peace with France at the expense of her gains from Sweden.

[5] Brandenburg's ally Leopold I, Holy Roman Emperor had concluded a separate peace with Louis XIV of France in February 1679, confirming the Treaty of Westphalia of 1648 which included the cession of Bremen-Verden and Swedish Pomerania to Sweden.

[12] Frederick William was told that Sweden would lose Stettin "no more than Stockholm", and that "first we [France] will take Lippstadt, Minden will cause us no trouble, then Halberstadt and Magdeburg will fall to us one after the other, and finally we will reach Berlin".

[12] With Brandenburgian Cleves occupied and Minden sieged, France also refused another offer of Frederick William to cede his Rhine provinces in return for Swedish Pomerania.

[12] On 29 June 1679, Frederick William I, Elector of Brandenburg signed the treaty,[9] thereby restoring Bremen-Verden[1] and most of Swedish Pomerania to Sweden[9][13] in return for a consolation payment from Louis XIV of France[9][14] and the reversion of East Frisia.

Swedish Pomerania (blue) and the Electorate of Brandenburg with Brandenburgian Pomerania (orange) between the treaties of Stettin (1653) and Saint-Germain (1679)