Such an offer was in exact accordance with his own wishes. But he had no intention of becoming king of Sweden merely to remain a tool in the hands of the spiritual and lay lords as the kings of Denmark had remained. Determined in his own mind to make himself absolute ruler of Sweden by crushing the bishops and barons, he recognised that Luther's teaching, with which he was familiar owing to his stay at Lubeck, held out good hopes for the success of such a project. The warm attachment of the Bishop of Upsala for the Danish faction had weakened the devotion of the people to the Church, and had prepared the way for the change which Gustavus contemplated. Some of the Swedish ecclesiastics, notably the brothers Olaf and Laurence Peterson, both students of Wittenberg, the former a well-known preacher at Stockholm, the latter a professor at Upsala, were strongly Lutheran in their tendencies, and were ready to assist the king. Though in his letters to Rome and in his public pronouncements Gustavus professed himself to be a sincere son of the Church, anxious only to prevent at all costs the spread of Lutheranism in his dominions, he was taking steps secretly to encourage his Lutheran supporters and to rid himself of the bishops and members of the religious orders from whom he feared serious opposition. As was done elsewhere, he arranged for a public disputation at which Olaf Peterson undertook to defend the main principles advocated by Luther, but the results of the controversy were not so satisfactory for his party as he had anticipated. Gustavus now threw off the mask of hypocrisy, and came forward boldly as the champion of the new religion. He removed those bishops who were most outspoken in their opposition, banished the Dominicans who stood loyal to Rome, and tried to force the clergy to accept the change. Anxious to enrich his treasury by confiscating the wealth of the Church he scattered broadcast Luther's pamphlet on the confiscation of ecclesiastical property, and engaged the professors of the University of Upsala to use their efforts to defend and popularise the views it contained. A commission was appointed to make an inventory of the goods of the bishops and religious institutions and to induce the monasteries to make a voluntary surrender of their property. By means of threats and promises the commissioners secured compliance with the wishes of the king in some districts, though in others, as for example in Upsala, the arrival of the commission led to scenes of the greatest violence and commotion. More severe measures were necessary to overawe the people, and Gustavus was not a man to hesitate at anything likely to promote the success of his plans. Bishop Jakobson and some of the clergy were arrested, and after having been treated with every species of indignity were put to death (1527).