Treaty of Roskilde
| Type | Bilateral treaty |
|---|---|
| Signed | 8 March 1658 |
| Location | Roskilde, Denmark |
| Original signatories |
Denmark Sweden |
| Ratifiers | Denmark Sweden |
The Treaty of Roskilde was concluded on 26 February (OS) or 8 March 1658 (NS) during the Second Northern War between Frederick III of Denmark–Norway and Charles X Gustav of Sweden in the Danish city of Roskilde. After a devastating defeat, Denmark-Norway was forced to give up a third of its territory to save the rest, the ceded lands comprising Blekinge, Bornholm, Bohuslän (Båhuslen), Scania (Skåne) and Trøndelag, as well as her claims to Halland.
After the treaty entered into force, Swedish forces continued to campaign in the remainder of Denmark-Norway, but had to withdraw from the Danish isles and Trøndelag in face of a Danish-Norwegian-Dutch alliance. The Treaty of Copenhagen restored Bornholm to Denmark and Trøndelag to Norway in 1660, while the other provinces transferred in Roskilde remain Swedish.
As the Northern Wars progressed, Charles X Gustav of Sweden crossed the frozen straits from Jutland and occupied the Danish island of Zealand, with the invasion beginning on 11 February 1658. A preliminary treaty, the Treaty of Taastrup, was signed on 18 February 1658 with the final treaty, the Treaty of Roskilde, signed on 26 February 1658.
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