In this year, 1527, a national Diet was held at Vesteras principally for the discussion of the religious difficulties that had arisen. Both parties, the supporters of the old and of the new, mustered their forces for a final conflict. Gustavus took the side of the so-called reformers, and proposed the measures which he maintained were required both in the interests of religion and of the public weal. The Catholic party were slightly in the majority and refused to assent to these proposals. Gustavus, though disappointed at the result, did not despair. He announced to the Diet that in view of its refusal to agree to his terms he could undertake no longer the government and defence of the country. A measure such as this, calculated to lead to anarchy and possibly to a new subjugation of the country by Denmark, was regarded by both sides as a national disaster, and secured for the king the support of the waverers. The masses of the people were alarmed lest their opposition might lead to the restoration of Danish tyranny, while the support of the nobles was secured by the publication of a decree authorising them to resume possession of all property handed over by their ancestors to religious institutions for the last eighty years. The remainder of the possessions of the Church were appropriated for the royal treasury. The king now issued a proclamation in favour of the new religion, insisted on the adoption of a liturgy in the vulgar tongue, and abolished clerical celibacy. At the National Assembly of Orebro (1529) the Catholic religion was abolished in favour of Lutheranism, and two years later Laurence Peterson was appointed first Lutheran Archbishop of Upsala.