(752-757), born Rome; died there. As pope he crowned Pepin King of the Franks, and from him received aid against the Lombard Aistulf. He became practically the first pope-king when he accepted from Pepin the cities of the exarchate of Ravenna, and of the Pentapolis, 756. By recognizing Desiderius as King of the Lombards he averted a civil war, 757. In the matter of iconoclasm he was less successful, and Emperor Constantine V attacked the veneration of images by promulgating the decrees of the mock-synod of Constantinople, 754.