Some historians have introduced a possibility, refuted by others, that Ragnhild's father was Alstan, a son of Folke Filbyter, and that she thus belonged to the early House of Bjälbo of subsequent Swedish and Norwegian kings.
In her case, the publication of Vitis aquilonia by Johannes Vastovius in 1623 had already caused a re-interpretation of the human figure in the seal of the City of Södertälje to be a stylistic depiction of Ragenilda.
Obvious similarities in style between Ragnhild's epitaph and that of the early 12th century sarcophagus of St. Botvid's brother Beorn in Botkyrka have led to an additional theory of the authenticity of the former.
From that epitaph: Ragnhild, ruler of the Swedes, a flower with no thorn, a queen for a realm, she goes out on a pilgrimage to Rome and Jerusalem to assure herself of graceful hope and to bear the Cross's victorious and for-all-collective tag of honor.
Oh, pious Madame, the patron saint of Tälje residents, pray for us for the good, heavenly gifts of Christ.A legend about her by King Sigismund's librarian and court priest has Ragnhild brought up from childhood fearing God, then married to Inge, living an angelic life on earth, dead of old age in 1120 and buried in Södertälje.