By his daring intrigue Earl Haakon had attained the goal of his desires. He had avenged his father's death, humiliated his enemies, and gained a power far beyond that of any of his ancestors. With a nature like his, however, no goal is final. The ease with which he had managed Harold Bluetooth and his nephew--using them as tools for his own ends--had, no doubt, inspired him with a supreme confidence in his ability, and a corresponding contempt of those whose shrewdness was inferior to his own. The purpose therefore soon matured in his mind to repudiate his obligations to the Danish king, and make himself the independent ruler of Norway. The opportunity for carrying this purpose into effect soon presented itself. The Emperor Otto I. of Germany, who claimed sovereignty over Denmark, died in 973, and was succeeded by his young son, Otto II. Harold Bluetooth, who had always resented the emperor's claim, even though he was forced to recognize it, made extensive preparations for a campaign against Otto II., and sent messengers to his vassal, Earl Haakon, commanding him to come to his aid with all the forces at his disposal. Earl Haakon, whatever his inclinations may have been, did not deem it advisable to disobey, and in the spring of the year 975 sailed southward with a large fleet and army. He did duty for a while in defending the wall of Dannevirke, and actually beat the emperor in a great battle. Then, feeling that his task had been accomplished, he boarded his ships and prepared to sail homeward. The emperor, however, hearing that Dannevirke was deserted by its defenders, returned for a second attack, and forced his way into Jutland. Whether Harold Bluetooth fought with him does not appear. We only know that he accepted a humiliating peace, reaffirming his vassalage, and, according to a creditable source, promising to introduce the Christian religion, both in his own kingdom and in Norway. It is probable that both Harold and his son, Sweyn Forkbeard, had been baptized before, but continued in their hearts to be devoted to the Asa faith. It was scarcely zeal for Christianity, but fear of the emperor, which induced Harold to send for Earl Haakon and force him to accept baptism and to promise to convert his countrymen to the new religion. It is strange that a man as shrewd as Haakon, after his recent desertion of Dannevirke, should have obeyed this summons. In all likelihood the victorious battle which he had fought gave him confidence in his power to justify himself; and there may also have been circumstances connected with the affair which changed its aspect to contemporaries. It is not inconceivable, however, that he really wished for a plausible pretext for rebellion, and deliberately took his chances. [Illustration: HAROLD BLUETOOTH.]