• February - Sweden pillage the Norwegian provinces of
Jämtland,
Härjedalen and
Trondheim. • 19 February - Armistice between Sweden and Denmark-Norway in
Swedish Estonia. • The Swedish battleship Mars was finished in 1564, under instruction from master shipwright Holgerd Olsson (Master Hollinger). It was the flagship of the Swedish fleet of 38 ships, and commanded by Admiral
Jakob Bagge., during the
Nordic Seven Years War (1563-1570). • 14 August – Swedish siege of
Lyckå in Blekinge. • 14 August -
Action of 14 August 1564 • 24 August - Lyckå taken by the Swedes. • 4 September - Sweden takes Danish
Ronneby and massacres its inhabitants dubbed the
Ronneby Bloodbath. • June - Wedding between
Princess Cecilia of Sweden and
Christopher II, Margrave of Baden-Rodemachern. • 27 September – Lyckås and Avaskär are burned by the Swedes who then evacuate Blekinge. • 11–13 October – Danish attack on Kalmar repelled. • 21 November – Peace treaty between Sweden and Russia, to last for seven years. • A map of Sweden, attributed to Ambrosius Thoms, was completed this year. It is presumed to have been created to aid in a
coup-d’etat to liberate
John III (half-brother of King
Erik XIV, who would become the next King of Sweden in 1569) from
Gripsholm Castle. John was imprisoned there in 1563 for treason, along with his new wife, on account of their marriage, because she was the younger sister of Poland's King
Sigismund II Augustus, with whom King Erik XIV was at war. ==Births==