|Covid-19|Monarch – Eric XIV
26 March - 250 Swedes die in an attempt to capture Bohus Fortress.
June - Nils Svantesson Sture falls from favor with the monarch and are exposed to public humiliation.
13 July – The Danes burn Bogesund.
15 July – The Danes burn Falköping.
23 July – The Danes burn Skara domkyrka.
26 July - Action of 26 July 1566
- Ivan the Terrible ask to have the King's sister-in-law Catherine Jagiellon delivered as a hostage to use against Poland.
- The Danes under Daniel Rantzau pillage Västergötland, while the Swedes pillage Skåne.
20 June - Sigismund III Vasa, monarch (died 1632)
15 October - Sigrid of Sweden (1566–1633), princess (died 1633)
September 9 - Klas Horn, naval admiral (born 1517)
1566 in Sweden Wikipedia
Events from the year 1566 in Sweden