The Swedish king broke the promises he had given at the Upsala Thing, and did not send his daughter Ingegerd to the appointed meeting-place on the boundary, when King Olaf of Norway came to fetch his bride. Shortly afterward the Swedes revolted, and the Swedish king again had to make concessions, and promise to make peace with the king of Norway. The latter had, in the meanwhile, against the wishes of her father, married Astrid, a younger half-sister of Ingegerd. At the peace of Konungahella, where the kings finally met, this marriage was approved by the Swedish king, the boundary lines between the two countries were finally agreed upon, and friendly relations were established.
After the peace of Konungahella, King Olaf was able to pay more attention to the domestic affairs of the country. He went north, and in the fall came to Nidaros, where he prepared to take up his winter residence. He made careful inquiries as to the condition of Christianity, and learned to his regret that it was not observed at all up north, in Halogaland, and was not observed as it should be in Naumdal and the interior of the Throndhjem country. In the spring Olaf started on an expedition north to Naumdal, where he summoned the peasants to meet him, and at every Thing he was accepted as king. He had the laws read to the people, and threatened them with loss of life, limbs, and property, if they would not subject themselves to Christian law. They all promised to obey, and the rich men made great feasts for the king. Thus he proceeded north to Halogaland, where Harek of Thiotta, a mighty man of the family of Harald the Fairhaired, after having made a feast for the king, was made lenderman, and was given the same privileges he had enjoyed under former rulers. The king remained most of the summer in Halogaland, went to all the Things, and baptized all the people. Thorer Hund, who lived on the island Biarkey and was one of the most powerful men in that northern country, also became one of Olaf's lendermen. Toward the end of the summer King Olaf sailed back to Throndhjem.
During his stay at Nidaros the king ascertained that the people of the interior of the Throndhjem country were still offering sacrifices to the heathen gods for peace and a good season, and that Olver of Eggja, a mighty man in that neighborhood, presided over these sacrifice-feasts, although he had twice assured the king that the people were loyal Christians. Learning that they were preparing such a feast at Mæren, the king proceeded to that place one night with three hundred and sixty armed men, captured Olver of Eggja, and had him killed together with many others, and severely punished all the peasants who had taken a leading part in the sacrifices. In this way he brought the people back to the Christian faith, gave them teachers, and built and consecrated churches. The widow of Olver of Eggja, who was young and handsome, of good family, and rich, was given by the king in marriage to Kalf Arneson, a young favorite among the king's men. The king also gave him an office, and Kalf thus became a great chief.