Cecilia Sigurdsdatter (1155-1186) was the illegitimate daughter of king Sigurd II of Norway and the mother of King Inge II of Norway. She married the Swedish Folkvid the Lawspeaker in 1177 and abandoned him to marry the Norwegian Birkebeiner Bård Guttormsson in 1184. She is known for the lawsuits she faced to avoid having her second marriage declared void since her first spouse was still alive.
- Helle, Knut. (2009, 13. februar). Cecilia Sigurdsdatter. I Norsk biografisk leksikon. Hentet 27. august 2016 fra https://nbl.snl.no/Cecilia_Sigurdsdatter.