Treaty of Stettin ( 1570 ) The Treaty of Stettin of 13 December 1570 , ended the Northern Seven Years ' War fought between Sweden and Denmark with her internally fragmented alliance of Lübeck and Poland . It also settled Swedish , Danish and Holy Roman Imperial claims regarding the Livonian War . Unfavourable for Sweden , it assured Danish hegemony in Northern Europe for a short period . Yet , because of its inconclusiveness it did not prevent further warfare between Denmark and Sweden ending only in the 1720s . Background . The Kalmar Union comprising Sweden , Denmark and Norway , had broken apart in 1523 . Frederick II of Denmark attempted to restore the Union under his rule . Frederick underlined his claim by using the Union ' s three crowns in his coat of arms and invaded Sweden in 1563 , both actions are considered the starting events of the Seven Years ' War . While the Danes had upper hand in land battles and captured Älvsborg , the Swedes performed better in naval battles and in Livonia , which had been secularized before and now was a subject of territorial competition of the surrounding powers . The treaty . In July 1570 , Maximilian II , Holy Roman Emperor initiated a peace congress in Stettin ( Szczecin ) , aiming to mediate between Sweden and Denmark . Several diplomats acted as mediator s : The host , Pomeranian duke Johann Friedrich of Pomerania - Stettin , acted as head of the delegates sent by his emperor , Maximilian ; French envoy at the Danish court Charles Dancey , who had been heavily involved in the preparation of the congress , was also among the mediators ; Martin Kromer , bishop of Warmia ( Ermland ) and others were sent by the Polish king Sigismund Augustus ; August of Saxony attended in person . Of the parties , Denmark was represented by Peder Bille ( Bilde ) , Jørgen Rosenkrantz , Henrik Rantzau , Niels Kaas , and Joachim Henke ( Hinck ) ; Sweden sent baron Jöran Gera , Bengt Gylta , Erik Gyllenstjerna ( Gyllenstierna ) , and others . In the resulting treaty , Sweden and Denmark agreed on the following : Outcome . With the treaty , Denmark became the supreme and dominating power in Northern Europe , yet failed to restore the Kalmar Union . The disputes concerning the three crowns insignia remained unsolved , and the unfavorable conditions for Sweden led to a series of future conflicts ending only in 1720 / 21 . Lübeck gained nothing from the treaty : though granted privileges by Sweden , these did not enhance Lübeck ' s position as John III of Sweden granted the same privileges to the Pomeranian port of Stralsund , his war - time ally . The payments promised to Lübeck were never transferred . Swedish pirates continued to capture Lübeck ' s shipments , and the town as well as the whole Hanseatic League had to acknowledge her degradation to a second - class power . Neither did Maximilian II , Holy Roman Emperor , pay the compensation promised to Sweden , and therefore lost his influence on the Baltic affairs . The terms of the treaty regarding Livonia were ignored , and the contemporary Livonian War dragged on . Denmark received all payments , though always late except for the first rate . John III was determined to keep his only port on the Scandinavian west coast , and his efforts included the sale of warships and devaluation of the Swedish currency .