into Poland. In July 1619 Czech Protestants rebelled against King Ferdinand II and offered the Bohemian crown to Elector Frederick V of the Palatinate. On 27 September 1619, probably on hearing the news, Władysław and Charles left Silesia in a hurry and on 7 October 1619 arrived in Warsaw. In December 1619, young Władysław's brother, Prince Charles Ferdinand, Duke of Opole, was chosen by Charles as auxiliary bishop of Wrocław, which was confirmed by the Polish episcopate. The Battle of the White Mountain (1620) broke the revolt in Bohemian Crown (i.e. including the opposition of the Protestants of Silesia). The Bishopric of Breslau (Wrocław) returned to the rule of the Archbishopric of Gniezno in 1620, having before been practically independent. Bishop Charles began the restoration of the principality of Neisse (Nysa) to the Catholic faith. The work was completed by his successor, Charles Ferdinand, Prince of Poland (1625–55), who spent most of his time in his own country, but appointed excellent administrators for the diocese, such as the Coadjutor-Bishop Liesch von Hornau, and Archdeacon Gebauer. Imperial commissioners gave back to the Catholic Church those church buildings in the chief places of the principalities which had become the property of the sovereign through the extinction of vassal families. Until 1632 de facto rule was held in Warsaw by King Sigismund III and not by the bishop or archbishop. According to the terms of the 1648 Treaty of Westphalia, the remaining churches, 693 in number, of such territories were secularized in the years 1653, 1654, and 1668. This led to a complete reorganization of the diocese. The person who effected it was Sebastian of Rostock, a man of humble birth who was vicar-general and administrator of the diocese under the bishops Archduke Leopold Wilhelm (1656–62) and Archduke Charles Joseph (1663–64), neither of whom lived in the territory of Breslau. After Sebastian of Rostock became bishop (1664–71) he carried on the work of reorganization with still greater success than before. Frederick of Hesse-Darmstadt, Cardinal and Grand Prior of the Order of St. John, was the next Bishop of Breslau (1671–82). The new bishop was of Protestant origin but had become a Catholic at Rome. Under his administration the rehabilitation of the diocese went on. He beautified the cathedral and elaborated its services. For the red cap and violet almutium of the canons he substituted the red mozzetta. He was buried in a beautiful