The epoch 1526–1620 was marked by increasing animosity between Catholic Habsburg kings (emperors) and the Protestant Moravian nobility (and other Crowns') estates. Moravia, like Bohemia, was a Habsburg possession until the end of World War I. In 1573 the Jesuit University of Olomouc was established; this was first university in Moravia. The establishment of a special papal seminary, Collegium Nordicum, made the university a centre of the Catholic Reformation and effort to revive Catholicism in Central and Northern Europe. The second largest group of students were from Scandinavia.