After the Battle of Mohács, the Ottomans were unsuccessful in their Siege of Vienna in 1529 and Ferdinand I managed to sign the Treaty of Constantinopole, postponing the Ottoman expansion attempts. Ferdinand and his brother Charles V – who was the Holy Roman Emperor at the same time – had to deal with not only the Ottoman threat, but also with the Schmalkaldic League which formed in 1531 to advance the interests of Lutheran states in the Holy Roman Empire. Largely Protestant Czech nobility had a favorable view of the Schmalkaldic League's goals and so when in 1546 Ferdinand I ordered the Czech estates to raise their army and march against the Protestant Electorate of Saxony as part of the Schmalkaldic War, they did so very reluctantly. The next year the Czech estates refused to gather an army again and rebelled, for which they were punished after the Schmalkaldic League decisively lost the Battle of Mühlberg. As a result, Ferdinand I managed to strengthen his position in the Land of the Bohemian Crown, limit city privileges and begin the process of recatholicization by inviting the Jesuit Order to Prague in 1556. &lt;br&gt;