Who married Svantepolk of Viby?

Svantepolk Knutsson (c. 1227 – c. 1310) was a Swedish knight and councilor. He became a wealthy feudal lord in Östergötland.

Benedicta of Bjälbo (Swedish: Bengta Sunesdotter; died 1261) was a Swedish noblewoman and a central figure in the incident known as the Maiden Abduction from Vreta, wherein she, like her mother, Princess Helen of Sweden before her, and her daughter, Ingrid Svantepolksdotter after her, was abducted from Vreta Abbey (Vreta kloster) by the man she later married. Her abduction was the subject of the folksong "Bridal Abduction of Young Lars" (Junker Lars klosterrov).