In 1515, Thomas Wyttenbach, Huldrych Zwingli's teacher, became a priest at the Minster of Bern. In the latter part of Wyttenbach's stay in Bern, a local priest, Berchtold Haller, lived with him. Around the time that Wyttenbach left Bern in 1520 to become a Reformer of his birthplace, Biel, Haller was elected a canon of the cathedral. In 1521, he became friends with Zwingli in Zurich and began to preach more Protestant sermons. In February, 1522, two Fastnacht plays were given at Bern, which attacked the Catholic Church. Due to the rising reformist sentiment, in June 1523, the city council ordered that the words of the Bible should be preached. By 20 November of that year, the nuns left the convent in Bern. But in 1524 the priest Meier, who sympathized with Haller, was compelled to leave Bern. That left Haller the only Protestant among the priests. Then, on 7 April 1525, the council issued a new decree restoring the Catholic worship, though with a few changes.