In 1403 the university forbade its members to follow the teachings of Wycliffe, but his doctrine continued to gain in popularity. In the Western Schism, the Bohemian nation took the side of king Wenceslaus and supported the Council of Pisa (1409). The other nations of the university declared their support for the side of Pope Gregory XII, thus the vote was 1:3 against the Bohemians. Hus and other Bohemians, though, took advantage of Wenceslaus' opposition to Gregory. By the Decree of Kutná Hora () on 18 January 1409, the king subverted the university constitution by granting the Bohemian masters three votes. Only a single vote was left for all other three nations combined, compared to one vote per each nation before. The result of this coup was the emigration of foreign (mostly German) professors and students, founding the University of Leipzig in May 1409. Before that, in 1408, the university had about 200 doctors and Masters, 500 bachelors, and 30,000 students ; it now lost a large part of this number, accounts of the loss varying from 5000 to 20,000 including 46 professors. In the autumn of 1409, Hus was elected rector of the now Czech-dominated rump university. The standing of the university declined, and it became merely a regional institution with a very low status. Soon, in 1419, the faculties of theology and law disappeared, and only the faculty of arts remained in existence. Protestant academy (1419–1622) The faculty of arts became a centre of the Hussite movement, and the chief doctrinal authority of the Utraquists. No degrees were given in the years 1417–30; at times there were only eight or nine professors. Emperor Sigismund, son of Charles IV, took what was left into his personal property and some progress was made. The emperor Ferdinand I called the Jesuits to Prague and in 1562 they opened an academy—the Clementinum. From 1541 till 1558 the Czech humanist (1516–1566) was a professor of Greek language. Some progress was made again when the emperor Rudolph II took up residence in Prague. In 1609 the obligatory celibacy of the professors was abolished. In 1616 the Jesuit Academy became a university. (It could award academic degrees.) Jesuits were expelled 1618–1621 during the early stages of the Thirty Years' War, which was started in Prague by anti-Catholic and anti-Imperial Bohemians. By 1622, the Jesuits had a predominant influence over the emperor. An Imperial decree of