Treaty of Bromberg
Treaty of Bromberg
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Treaty of Bromberg

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Treaty of Bromberg

The Treaty of Bromberg (German: Vertrag von Bromberg, Latin: Pacta Bydgostensia) or Treaty of Bydgoszcz was a treaty between John II Casimir Vasa and Elector Frederick William of Brandenburg-Prussia that was ratified at Bromberg (Bydgoszcz) on 6 November 1657. The treaty had several agreements, including the Treaty of Wehlau, signed on 19 September 1657 by the Brandenburg–Prussian and Polish–Lithuanian envoys in Wehlau (Welawa, now Znamensk). Thus, the Treaty of Bromberg is sometimes referred to as treaty of Wehlau-Bromberg or Treaty of Wehlau and Bromberg (Polish: traktat welawsko-bydgoski).

In exchange for military aid in the Second Northern War and the return of Ermland (Ermeland, Warmia) to Poland, the Polish-Lithuanian monarch granted the Hohenzollern dynasty of Brandenburg hereditary sovereignty in the Duchy of Prussia, pawned Draheim (Drahim) and Elbing (Elbląg) to Brandenburg and handed over Lauenburg and Bütow Land to the Hohenzollerns as a hereditary fief.

The treaty was confirmed and internationally recognized in the Peace of Oliva in 1660. Elbing was kept by Poland, but Lauenburg and Bütow Land and Draheim were later integrated into Brandenburg-Prussia. The sovereignty in Prussia constituted the basis for the later coronation of the Hohenzollern as Prussian kings. Wehlau-Bromberg remained in effect until it was superseded by the Treaty of Warsaw [de] (18 September 1773) after the First Partition of Poland. The Treaty of Bromberg later became regarded as one of the worst mistakes in Polish foreign policy towards Prussia after its consequences had become fatal to Poland.

The Duchy of Prussia was established as a Polish fief under duke Albrecht (Albert) in the Treaty of Cracow of 8 April 1525. The fief was hereditary, and if Albrecht or his brothers' house became extinct in the male line, the fief was to pass to the Polish king, who was to appoint a German-speaking Prussian-born governor. On 4 June 1563, that provision was changed by King of Poland and Grand Duke of Lithuania Sigismund II Augustus in a privilege issued at Petrikau, which, in addition to Albrecht's branch of the House of Hohenzollern (Hohenzollern-Ansbach), allowed the Brandenburg branch of the Hohenzollern as possible successors. The privilege provided for the succession of the Brandenburgian electors as Prussian dukes upon the extinction of the House of Hohenzollern-Ansbach in 1618.

In 1656, during the early Second Northern War, the Brandenburgian Hohenzollern took the Prussian duchy and Ermland (Ermeland, Warmia) as Swedish fiefs in the Treaty of Königsberg, before the Swedish king released them from the vassalage and made them absolute sovereigns in those provinces. After fighting along with the Swedish Army in 1656, most prominently at the Battle of Warsaw, Hohenzollern Frederick William I was willing to abandon his ally when the war had turned against them and signalled his willingness to change sides if Polish King and Lithuanian Garnd Duke John II Casimir Vasa would grant him similar privileges as previously Swedish King Charles X Gustav, conditions that were negotiated in Wehlau (Welawa, now Znamensk) and Bromberg (Bygost, Bydgoszcz).

The Polish interest in an alliance with Brandenburg-Prussia was born out of the need to end the war against Sweden as soon as possible. On 3 November 1656, the Truce of Vilna had promised Alexis of Russia's election as a successor on the Polish throne at the next diet in return for halting his offensive in Poland–Lithuania and to fight Sweden instead. In the Grand Duchy of Lithuania, there was support for the treaty from the nobles, who hoped for positions with more privilege, but that was not true for the Kingdom of Poland, where the elites looked for ways to circumvent Alexis's succession. For a fast end to the war against Sweden to be able to avoid the implementation of the Truce of Vilnius, the anti-Swedish alliance had to be extended.

The newly won Russian ally was reluctant to support Poland against Sweden as long as no diet had confirmed the truce. A second ally, the Austrian Habsburgs, were won in the first and the second Vienna Treaties, but the Habsburg forces were to be maintained by Poland, the prize for the alliance was bound to rise while the war lasted. A third ally was Denmark-Norway, which joined the anti-Swedish coalition in June 1657 after it had been triggered by the second Treaty of Vienna. However, Denmark was not fighting on Polish soil, and although its involvement tied down Charles X Gustav's forces and a formal alliance with Poland was concluded in July, the Danish aimed to recover Scandinavian territories, which had been lost at the Second Treaty of Brömsebro (1645).

The Habsburgs' interest in the treaty was to build up good relations with Frederick William I. As a prince-elector, he was a valuable ally if he supported their policy in the Holy Roman Empire. Thus, the Habsburgs were interested in Frederick William I changing sides and sent diplomat Franz Paul Freiherr von Lisola to mediate a respective settlement.

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