Margaret Fredkulla had been married to King Magnus of Norway in 1101 as a part of the peace treaty between Sweden and Norway.

Often referred to as Margaret Fredkulla (Margaret the Maiden of Peace), she had brought with her large fiefs and areas in Sweden as her dowry, probably in Västergötland.

Made a widow in 1103 after two years of childless marriage, she had soon left Norway.

Her departure is seen as an insult by the Norwegians, who had expected her to stay, and she is accused of having stolen the holy relics of Saint Olav.

In 1105, she marries King Niels of Denmark, described as a passive monarch who lacks the capacity to rule and who leaves the affairs of the state to his queen.

With his blessing, Margaret becomes the de facto Queen regnant of Denmark.

She is described as a wise ruler, and the relationship between Denmark and her birth country Sweden will be very peaceful during her time as queen.