St. Bridget of Sweden: A Chapter of Mediaeval Church History. E-book. Formato PDF Sven Magnus Gronberger   -  Forgotten Books, 2017  - 

Benedict of Bengt, the heir of Ulfosa, had married a poor girl of noble family, and these were the grandparents of Birgitta. His wife was called Skon Sigrid, or beautiful Sigrid, and her only daughter Ingeborg married Birger Peterson, a descendant of St.