Born abt 1130. Parents: Prince Henrik Skadelår of Denmark and Ingrid, granddaughter of Inge the older.
Recognized as king in 1160 after killing his predecessor Erik Jedvardsson. Magnus was killed in 1161.
Married to Brigida, an illegitimate daughter of King Harald Gille of Norway.
Magnus is also accused of having been behind the murder of Sverker I. In 1161 Magnus was defeated by Karl Sverkersson near Örebro.