She played a political role in the struggle between Albert, King of Sweden and Queen Margaret I of Denmark over the Swedish throne in the late 14th century.
Margareta Dume belonged to an originally German noble family who lived in Swedish Finland since 1362.
In 1373, she married the powerful Bo Jonsson (Grip), and he gave important posts to her five brothers Klaus, Gerhard, Henneke, Volrad and Berthol.
She contested this, left for the Swedish royal court and made the King the protector of her and her children's rights in the civil war-like conflict which erupted over the inheritance of her spouse in 1387.
In 1394, she married the Swedish noble Bengt Niklisson, returned to Sweden with him and made her peace with Queen Margaret.