Earl Sweyn, though he had yet a large following and sufficient resources to continue the struggle, sailed eastward to Sweden where he was well received by his brother-in-law, King Olaf the Swede. He seems to have contemplated a fresh campaign against Norway, and was encouraged by the Swedish king to avenge his defeat. Instead of that, however, he undertook during the following summer a warlike expedition into Russia, probably to replenish his treasury, was taken ill and died on the way (1016). Olaf availed himself of the earl's absence to extort oaths of allegiance from the peasantry along the coast; he hesitated, however, for some reason to attack Erling Skjalgsson and passed by the provinces which he held in fief without landing. He returned to Nidaros, rebuilt the ruined "king's hall," and the Church of St. Clement. From his sojourn abroad he had learned a lesson in regard to the advantages of commercial intercourse, and he encouraged merchants and artisans to take up their abode in the resuscitated city. He had small confidence in the good-will of the Trönders; and therefore liked to surround himself with men who were free from local ties and traditions. The death of Earl Sweyn, however, as soon as the rumor of it reached Norway, changed the situation. The Trönders, having now no chieftain of their own, began to send the king friendly messages and in various ways to court his favor. Presently he felt himself safe in summoning chiefs and peasantry to meet him at the _thing_, and his formal recognition as king followed in all the shires of Tröndelag. But it will be remembered that four of these shires, besides the adjacent provinces of Nordmöre, Raumsdale, and Söndmöre, had after the battle of Svolder been awarded to the king of Sweden, in whose behalf Earl Sweyn had governed them. A great wrath, therefore, possessed King Olaf the Swede, when he heard that the Trönders had sworn allegiance to "Olaf the Big." This was the nickname which he had conferred upon his opponent on account of his stoutness and burly frame. He could never refer to him except with oaths and opprobrious terms. His threats and insults, however, brought no response, and finally he determined to send a party of tax-gatherers into his former provinces. Having vainly solicited the tax, they sought an audience with King Olaf, who commanded them to go home and invite the King of Sweden to meet him at the boundary between the two countries. "Then," he said, "he may, if he chooses, come to an agreement with me, on the condition that each keeps the kingdom to which his birthright entitles him."