George of Poděbrady, later to become the "national" king of Bohemia, emerged as leader of the Utraquist regency. George installed another Utraquist, John of Rokycan, as archbishop of Prague and succeeded in uniting the more radical Taborites with the Czech Reformed Church. The Catholic party was driven out of Prague. After Ladislaus died of leukemia in 1457, the following year the Bohemian estates elected George of Poděbrady as king. Although George was noble-born, he was not a successor of royal dynasty; his election to the monarchy was not recognised by the Pope, or any other European monarchs.