The next cause was the Letter of Majesty itself. As soon as that Letter was closely examined, a flaw was found in the crystal. We come to what has been called the "Church Building Difficulty." It was clearly provided in one clause of the Letter of Majesty that the Protestants should have perfect liberty to build churches on all Royal estates. But now arose the difficult question, what were Royal estates? What about Roman Catholic Church estates? What about estates held by Catholic officials as tenants of the King? Were these Royal estates or were they not? There were two opinions on the subject. According to the Protestants they were; according to the Jesuits they were not; and now the Jesuits used this argument to influence the action of Matthias, the next King of Bohemia. The dispute soon came to blows. At Klostergrab the land belonged to the Catholic Archbishop of Prague; at Brunau it belonged to the Abbot of Brunau; and yet, on each of these estates, the Protestants had churches. They believed, of course, that they were in the right. They regarded those estates as Royal estates. They had no desire to break the law of the land. But now the Catholics began to force the pace. At Brunau the Abbot interfered and turned the Protestants out of the church. At Klostergrab the church was pulled down, and the wood of which it was built was used as firewood; and in each case the new King, Matthias, took the Catholic side. The truth is, Matthias openly broke the Letter. He broke it on unquestioned Royal estates. He expelled Protestant ministers from their pulpits, and put Catholics in their place. His officers burst into Protestant churches and interrupted the services; and, in open defiance of the law of the land, the priests drove Protestants with dogs and scourges to the Mass, and thrust the wafer down their mouths. What right, said the Protestants, had the Catholics to do these things? The Jesuits had an amazing answer ready. For two reasons, they held, the Letter of Majesty was invalid. It was invalid because it had been obtained by force, and invalid because it had not been sanctioned by the Pope. What peace could there be with these conflicting views? It is clear that a storm was brewing.