- Mar 16 Michael Franck, German composer, poet. and baker, born in Schleusingen, Electorate of Saxony (now Germany) (d. 1667) [1]
- Mar 18 Frederick III, King of Denmark and Norway (1648-70), born in Haderslev, Denmark (d. 1670)
- Mar 22 John II Casimir Vasa [Jan Kazimierz], King of Poland and Grand Duke of Lithuania (1648-68), born in Kraków, Poland (d. 1672)