Monarch – Gustav I
12 June - Foundation of Helsingfors.
- The witch trial against Lasses Birgitta, referred to as the first execution for witch craft in Sweden.
4 October - Charles IX of Sweden, monarch (died 1611)
Date unknown - Nicolaus Olai Bothniensis, archbishop (died 1600)
Date unknown - Karin Månsdotter royal mistress and queen (died 1612)
Unknown date - Lasses Birgitta, alleged witch
1550 in Sweden Wikipedia
Events from the year 1550 in Sweden