At this point Granvella suspended the conference, to be resumed at Regensburg, whither the emperor had summoned a diet, which he promised to attend in person. This diet, from which the emperor anticipated brilliant results, was called to order 5 April 1541. As legate of the pope appeared Cardinal Contarini, assisted by the nuncio Morone. Calvin was present, ostensibly to represent Lüneburg, in reality to foster discord in the interest of France. As collocutors at the religious conference which met simultaneously, Charles appointed Eck, Pflug, and Gropper for the Catholic side, and Melanchthon, Bucer, and Pistorius for the Protestants. A document of mysterious origin, the "Regensburg Book", was presented by Joachim of Brandenburg as the basis of agreement. This compilation, it developed later, was the result of secret conferences, held during the meeting at Worms, between the Protestants, Bucer and Wolfgang Capito, on one side, and the Lutheranizing Gropper and a secretary of the emperor named Veltwick on the other. It consisted of twenty-three chapters, in which the attempt was made so to formulate the controverted doctrines that each party might find its own views therein expressed. How much Charles and Granvella had to do in the transaction, is unknown; they certainly knew and approved of it. The "Book" had been submitted by the Elector of Brandenburg to the judgment of Luther and Melanchthon; and their contemptuous treatment of it augured ill for its success.