April - The 1654 Anglo-Swedish alliance is forged to offset the Danish-Dutch alliance.
June 6 – Charles X Gustav succeeds his cousin Christina on the Swedish throne. After her abdication on the same day, Christina, now the former reigning queen of a Protestant nation, secretly converts to Catholicism.
- The Wedding between Charles X Gustav and Hedwig Eleonora of Holstein-Gottorp.
Births
24 march - Johan Peringskiöld, antiquarian (died 1720)
may - Nicodemus Tessin the Younger, architect (died 1728)
Deaths
- Axel Oxenstierna, politician (born 1583)
- Ebba Mauritzdotter Leijonhufvud, courtier (born 1595)
