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Treaty of Roskilde

Denmark, Norway, and Sweden [1658]

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The Treaty of Roskilde, signed on February 26, 1658, was a peace agreement between Sweden and Denmark-Norway. In this treaty, Denmark ceded its fertile provinces of Skåne, Blekinge, and Halland, along with the Baltic island of Bornholm and the Trøndelag region of Norway, to Sweden.1

However, this peace was short-lived. Sweden's King Charles X Gustav invaded Denmark again less than six months later. Despite initial Swedish advances, the Danish defense of Copenhagen, aided by a Dutch fleet, proved crucial. The war concluded with the Treaty of Copenhagen in 1660. This subsequent treaty returned Fünen and Bornholm to Denmark and Trøndelag to Norway, but Denmark's former mainland provinces east of The Sound remained part of Sweden. The Treaty of Copenhagen, along with the Treaty of Roskilde, largely established the modern boundaries between Denmark, Norway, and Sweden.1

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