Treaty of Roskilde

Date: March 8, 1658 • Location: Moscow, Russia

This milestone marked the outbreak and beginning of this historic period, which spanned 1658.

After a devastating defeat in the Second Northern War, King Frederick III of Denmark–Norway was forced to give up nearly half his Danish territory to Sweden to save the remainder.

The Northern War of 1655–1660 was fought between the Swedish Empire and the Polish–Lithuanian Commonwealth, with participation at different times by Russia, Brandenburg-Prussia, the Habsburg monarchy, and Denmark–Norway. It ended with the treaties of Copenhagen and Oliva in 1660.