Hjalmar and Ingeborg were a legendary Swedish duo. The male protagonist Hjalmar and his duel for Ingeborg figures in the Hervarar saga and in Orvar-Odd's saga, as well as in Gesta Danorum, Lay of Hyndla and a number of Faroese ballads. Hjalmar never lost a battle until meeting a berserker wielding the cursed sword Tyrfing.
Hjalmar was one of the mythical Swedish king Yngvi's housecarls at Uppsala. He and princess Ingeborg were in love, but the king said no to his requests for marriage, since he hoped for a suitor with a better pedigree.
Hjalmar's reputation as a courageous and valiant warrior was great and it reached the most remote parts of Norway, where the Norwegian hero Orvar-Odd felt a desire to test his fighting skills with Hjalmar. Thus Orvar-Odd sailed to Sweden with five ships and met Hjalmar who had fifteen ships. Hjalmar could not accept such an uneven balance of strength and sent away ten of his own ships so that the forces would be even. The two warriors fought for two days with a lot of blood-letting and poetry, but it was a draw. Finally, they realized that they were equals and decided to become Blood brothers by letting their blood flow under a strand of turf raised by a spear. Then the strand of turf was put back during oaths and incantations. Orvar-Odd accompanied Hjalmar back to Uppsala, where he soon discovered the feelings between Hjalmar and Ingeborg. Orvar-Odd offered to help Hjalmar elope with Ingeborg, but Hjalmar declined and suffered patiently until a suitor arrived that Hjalmar could not tolerate.
Further south, on Bolmsö, lived the feared berserker Arngrim and his twelve sons. They were all infamous berserkers who spread fear and destruction throughout the North. The eldest was a head taller than the rest and his name was Angantyr, and it was to him that Arngrim had entrusted the sword Tyrfing, which had been cursed by its makers, the Dwarves Dvalinn and Durin. This sword would cause three evil deeds and one man had to die every time it was unsheathed. The next eldest was Hjorvard and one Yule, when everyone was at home and bragged about what they would accomplish the following year, Hjorvard declared that he was to marry princess Ingeborg at Uppsala.