Nevertheless the queen mother, Bertrada, carried out her design, and the king Desiderius seemed to attain the summit of security, so far at least as this, that though his son Adelchis did not obtain the princess Gisela, Charles took his daughter Ermengarde. He also sent her back to her father the next year, and his friend and secretary, Eginhard, has left unexplained the cause of this repudiation. No historian has thrown light upon this particular in the history of Charles, either how he came to brave the anathema of Pope Stephen III. by deserting a lawful wife, or how he came to send back in a year the unhappy princess whom he had unlawfully taken, or how we find Hildegarde acknowledged as his lawful wife from 771 to her death in 786. The blot remains unerased upon the memory of him who was otherwise the greatest of the Christian emperors. With the marriage—if it is to be so called—of his daughter with Charles, Desiderius seemed to have reached well nigh the end of his ambition. Christophorus and his son Sergius had put an end to the usurpation of Constantine, were the heads of the national Roman party,(231) and the soul of Pope Stephen III.’s government. Desiderius in a visit to Rome managed to set the Pope against them. He had a Lombard party there, at the head of which was a certain Paul Afiarta, high in the Pope’s service. Christophorus and his son Sergius both lost their lives. They had urged the king of the Lombards to restore to the Holy See the rights which he kept back. Desiderius was infuriated by their conduct(232) and strove to destroy them.(233) Desiderius was encamped outside of St. Peter’s. A company of Lombard soldiers dragged the two victims, who had been taken out of St. Peter’s, to the gate of the city, at the bridge: tore out their eyes, of which outrage Christophorus died in three days: Sergius survived in prison during two years, that is, to the death of Pope Stephen, when he was most atrociously murdered by order of Paul Afiarta.