Claim: Ingeborg Eriksdotter could not have any children.
Evidence: Her two older sons Olaf (1262 – 15 March 1267) and Magnus (b. and d. 1264) died in infancy, but the youngest two would later become Kings of Norway: Eric II (1268 – 13 July 1299) and Haakon V (ca. 10 April 1270 – 8 May 1319).