Prince and Duke. Bielbo Dynasty. Son of King Magnus III Barnlock and Queen Haelwig. Duke of Sudermania from 1303. Rebelled with his brother Duke Waldemar against their brother King Birger, so that the two rebels were locked up to die in a castle tower. His widow Ingiburga, originally a Princess of Norway, made sure their baby son became King of Sweden as Magnus IV and of Norway as Magnus VII.
Ingiburga of Norway and Sweden
1301–1361 (m. 1312)