In August, Ferdinand's envoys had demanded the transfer of the late John Zápolya's realm to Ferdinand in accordance with the Treaty of Várad. Peter Perényi, who had been the commander of Zápolya's troops in Upper Hungary, and Franjo Frankopan, Archbishop of Kalocsa, soon deserted to Ferdinand. The wealthy Stephen Majláth expelled most of John Sigismund's supporters from Transylvania in an attempt to seize the province for himself. Ferdinand's envoy, Hieronymus Łaski, informed Suleiman of the Treaty of Várad, asking the sultan to consent to the unification of Hungary under Ferdinand's rule. Instead, the sultan stated that he supported John Sigismund and had Łaski arrested.