|Covid-19|Monarch – Charles XI
- The Second Bremen War.
- The Lund University is founded.
- Second return to Sweden of Christina, Queen of Sweden.
- Publication of the Upsalia antiqua by Johannes Schefferus.
4 September - Anna Maria Ehrenstrahl, painter (died 1729)
9 November - Carl Gustaf Armfeldt, officer (died 1736)
- Adolph John II, Count Palatine of Kleeburg, duke (died 1701)
February - Gustav Evertsson Horn, military and politician (born 1614)
1666 in Sweden Wikipedia
Events from the year 1666 in Sweden