To end the oppression of their faith, the estates of Silesia joined the Protestant estates of Bohemia and stopped paying taxes to the emperor in 1609. After the Bohemians forced the emperor to issue his "Maiestas Rudolphina" (Letter of Majesty) the emperor was moved to publish another similar letter for Silesia containing further rights. When Rudolf tried to withdraw from these agreements in 1611, the estates of Bohemia and Silesia declared allegiance to Matthias, who already owned the Archduchy of Austria, the Margraviate of Moravia and the Kingdom of Hungary. Matthias affirmed the Letter of Majesty and granted the Silesian estates an independent German chancellery in Prague (also responsible for both Lusatias). Silesian Protestants were weakened when several Silesian rulers converted to Calvinism or back to Catholicism.