Åsta Gudbrandsdatter - Wikipedia

In the summer of 994, although already married to Åsta, Harald traveled to the Baltic and proposed marriage to his foster-sister Sigrid. He had learned that her landholdings in Sweden were no less extensive than his own in Norway, and promised to abandon Åsta, who although "good and clever" was not as well-born as he was. Sigrid refused, objecting that Harald should feel fortunate in his existing marriage and that Åsta was carrying Harald's child. When she rode off, Harald pursued her back to her estate. That evening, Sigrid hosted a lavish feast at which Harald and his companions became drunk. Under cover of darkness, she ordered her armed men to set fire to the hall in which Harald slept, and he was killed; those of his companions who escaped the flames were put to the sword.

Following this episode, Sigrid was called Storråda, 'the Haughty.'

On learning of her husband's death, Åsta was outraged both by Harald's infidelity and his murder. She returned immediately to the home of her father Gudbrand Kula in Oppland, where later that year she gave birth to a son, whom she named Olaf. He would later be renowned as St. Olaf, King of Norway from 1015 to 1028.

Soon after Harald Grenske's death, Åsta married Sigurd Syr, king of Ringerike, and brought the child Olaf with her to be raised in the home of his stepfather. When King Olaf Tryggvason of Norway arrived in 998 to convert the populace of Ringerike to Christianity, Sigurd, Åsta, and Olaf were all baptized, with the king himself acting as Olaf's godfather.