Conradia, the younger son of Conrad, was an infant at his father's death. He was acknowledged as emperor by the Ghibelines, who received him in triumph at Rome; but Pope Alexander IV. published a crusade against him; and Urban VII. gave the empire to Charles of Anjou, brother of Louis IX., king of France. The unfortunate youth, though powerfully supported even by the Turks, lost a battle, in which he was taken prisoner; and in 1229, in the eighteenth year of his age, he was publicly beheaded at Naples, by order of his base opponent. With him the race of the dukes of Swabia, which had produced several kings and emperors, became extinct.