Ingeborg was born the daughter of Eric IV of Denmark and Jutta of Saxony. Ingeborg was only about six years-old when her father was killed. Her mother returned in Saxony and married Count Burchard VIII of Querfurt-Rosenburg. In large part, Ingeborg and her three sisters lived in the court of her uncle King Christopher I of Denmark and Queen Margaret Sambiria. The four sisters were heirs to substantial lands in Denmark. The struggle to claim Ingeborg's inheritance from her murdered father would later involved Norway in intermittent conflicts with Denmark for decades to come. Ingeborg was promised in marriage by the Danish regency government to crown prince Magnus, the son and heir of King Haakon IV of Norway. Ingeborg arrived in Tønsberg on 28 July 1261, after she being retrieved at the instruction of King Haakon from the monastery in Horsens. On 11 September 1261, she married Prince Magnus in Bergen. Magnus and Ingeborg were crowned directly after their marriage, and Magnus was given the district of Ryfylke for his personal upkeep. The marriage was described as happy. On 16 December 1263 King Haakon IV of Norway died while fighting the Scottish king over the Hebrides, and Magnus became the ruler of Norway. Ingeborg is not known to have played any part in politics as his queen. Her two older sons Olaf and Magnus died in infancy, but the youngest two would later become Kings of Norway: Eric II and Haakon V. In 1280, she became a widow. Ingeborg was an important figure in the leadership of the country during the minority of King Eirik, though she was not formally named regent. Her influence grew after her son was declared adult in 1283. Her principal ally was Alv Erlingsson, who had been a second cousin of her husband King Magnus and served as the governor Borgarsyssel which today makes up the county of Østfold. During the reign of her cousin King Eric V of Denmark, Ingeborg begun a feud regarding her inheritance, which had never been given her. This largely private feud caused hostility between Norway and the German Hanseatic cities and a tense relationship with Denmark. Several Danish nobles, including Count Jacob of Halland, took her side against the Danish monarch, but she died before the affair was finished.
