Births on March 17

Giovanni Francesco Commendone, Catholic cardinal (d. 1584)

Giovanni Francesco Commendone (17 March 1523 – 26 December 1584) was an Italian cardinal and papal nuncio.

6 Jun

Kalmar Union
Gustav Vasa, the Swedish regent, is elected King of Sweden, marking a symbolic end to the Kalmar Union. This is the Swedish national day.
10 Jun

Frederick I of Denmark
Copenhagen is surrounded by the army of Frederick I of Denmark, as the city won't recognise him as the successor of Christian II of Denmark.