On 20/26 April 1220, the German princes assembled at Frankfurt elected Henry King of the Romans, for which the Emperor issued "Confoederatio cum principibus ecclesiasticis", favoring the prince-bishops. "The chief Princes present at Frankfort were the Archbishops of Mayence, Cologne, Treves, and Magdeburg, several Bishops, the Dukes of Bavaria and Brabant, the Landgrave of Thuringia, the Margraves of Namur and Baden, the Counts of Holland and Cleves, and the officials of Frederick's court." The election had been a condition to Frederick II redeeming his Crusade promises of 1215, because the succession question, in case of the emperor's death on the crusade, was clarified by them. However, Pope Honorius III did not recognize the election and also deprived Henry of his rights over the Sicilian kingdom, because he (just as his predecessor) wanted to prevent the union of both countries. Also, numerous German princes had rejected the election in the first moment.