capital of Hungary without opposition. Bálint Török was captured in the sultan's camp. Suleiman declared that John Sigismund could retain the territories to the east of the river Tisza in exchange for a yearly tribute of 10,000 florins. First rule Isabella and Martinuzzi left Buda on 5 September 1541, taking John Sigismund and the Holy Crown with them. She and her son settled in Lippa, which was the center of an old domain of the Zápolya family. The delegates of the counties of John Sigismund's realm met in Debrecen on 18October. They swore fealty to him and acknowledged the sultan's suzerainty. Martinuzzi signed a treaty with FerdinandI's representative, Caspar Serédy, in Gyalu (now Gilău in Romania) on 29December. According to the Treaty of Gyalu, Hungary was to be reunited under the rule of Ferdinand, but John Sigismund's right to the Zápolyas' domains in Upper Hungary was confirmed. On 29 March 1542, the "Three Nations of Transylvania" urged Isabella to move from Lippa (which was located near the Ottoman Empire) to Transylvania. After John Statileo, Bishop of Transylvania, died in April, the Diet granted the domains of the bishopric to the royal family. Isabella and John Sigismund moved to Gyulafehérvár in June, taking up residence in the bishops' castle. The Transylvanian Diet confirmed the Treaty of Gyalu in August. The representatives of the noblemen of the Partium (the counties between the Tisza and Transylvania) also consented to a war against the Ottoman Empire in November. However, the Habsburgs' army was unable to recapture Pest or defeat the Ottomans. Caspar Serédy came to Gyalu to take possession of John Sigismund's realm on Ferdinand's behalf, but Isabella refused him on 17December. Three days later, the Diet declared the Treaty of Gyalu null and void, over the objections of the delegates of the Transylvanian Saxons. The relationship between Isabella and Martinuzzi was tense. Martinuzzi continued to control state administration and finance even after the Diet confirmed Isabella's superior position in February 1543. The first tribute from John Sigismund's realm was sent to the Ottoman Sultan in June. In the same month, Saxon clergymen from Kronstadt (now Brașov in Romania), who had adopted Lutheranism, participated in a debate with Catholic priests in the presence of the queen and Martinuzzi in Gyulafehérvár. The Saxons were allowed to leave, although Martinuzzi, who was bishop of Várad, wanted to bring them before court on charges of heresy. In