 Ferdinand also had the support of his brother, the Emperor Charles V.

On 10 November 1526, John Zápolya was proclaimed king by a Diet at Székesfehérvár, John Zápolya was elected in the parliament by the untitled lesser nobility (gentry).Nicolaus Olahus, secretary of Louis, attached himself to the party of Ferdinand but retained his position with his sister, Queen Dowager Mary.Ferdinand was also elected King of Hungary, Dalmatia, Croatia, Slavonia etc.