In 1318-1319, she was Swedens de facto ruler, and from 1319 until 1326, she was Swedens first de jure female regent. Ingeborg was born as the legitimate daughter of King Håkon V of Norway from his marriage with Euphemia of Rügen. As a child, she was first betrothed to Magnus Birgerson, in 1312, Ingeborg and Eric were formally married in a double wedding in Oslo, at the same time, her cousin Ingeborg Eriksdottir of Norway, married Erics brother duke Valdemar Magnusson. At her wedding, her mother Queen Euphemia had published the recently translated famous poems, the couple had two children before Duke Eric was murdered. Upon the imprisonment of her spouse and her brother-in-law, she and her cousin and sister-in-law, Ingeborg Eriksdottir, later the same year, their husbands were confirmed to have died. Her son Magnus VII of Norway, at the age of 3, was proclaimed king of Norway upon her fathers death, Ingeborg was recognized as formal regent of her son in Norway. Duchess Ingeborg held her own court at her residence in Varberg, the exact position of Ingeborg in the regency council is hard to define properly due to the documentation. Mats Kettilumndsson, her ally, presided over the Swedish regency council alongside the two Duchesses Ingeborg, Ingeborg Håkansdotter and her cousin and sister-in-law Ingeborg Eriksdottir, Magnus, already King of Norway, was elected King of Sweden with the approval of the Norwegian council in her presence. Ingeborg was the one with a seat in both the Swedish and the Norwegian minor regency and council of state. She was the independent reigning duchess of her own fiefs, which were autonomous under her rule, Ingeborgs position at court was not well-defined, she was the Kings Mother, but without being a dowager Queen. She was criticized for her way of conducting her own politics without the counsel of the Swedish and Norwegian councils,1 October 1320, she liberated Riga from its debts in her name on behalf of her son. She was known to large donations to her supporters. Canute Porse had been one of the supporters of her spouse and was appointed governor of Varberg, Ingeborg surrounded herself with young foreign men, thought to affect her politics, of which Canute was the most known. Ingeborg and Canute had the ambition to make the then Danish Scania a part of her possessions, in 1321, Ingeborg arranged a marriage with her daughter Euphemia and Albert II, Duke of Mecklenburg. The marriage was arranged with the terms that Mecklenburg, Saxony, Holstein, Rendsburg and this was approved by the council of Norway but not Sweden. To finance the invasion, Ingeborg took a loan from Stralsund with free trade in Sweden, when Ingeborgs forces under command of Canute invaded Scania in 1322-23, Mecklenburg betrayed her to Denmark and the alliance was broken. In 1323, Ingeborg was forced to accept the terms and give up several of her strategical castles,20 February 1323, also the Norwegian regency council rebelled against Ingeborg. She was accused of misusing the royal seal, to have broken the peace with Denmark and for greater costs, after 1323, Ingeborgs power was limited to what was approved by votes in the councils, which in practice had deposed her
Duchess Ingeborg's bust at Linköping Cathedral
Seal of Duchess Ingeborg; Regent of Norway 1319-27, Regent of Sweden 1319-26.