Sigurd Havtoresson

Sigurd Havtoresson (c. 1315–c. 1390) was a grandson of King Haakon V Magnusson through his mother Agnes, his illegitimate daughter, and with his brother Jon belonged to the most powerful families in Norway. His father, the knight Havtore Jonsson, was of the Sudrheim family, and Sigurd held the family seat at Sudreim.

He held senior offices and a seat on the Council of the Realm, and became the largest private landowner in late medieval Norway. His daughter Agnes Sigurdsdatter was the mother of Sigurd Jonsson, who later became regent of Norway.