Pope Adrian I., who died 795, in his troubles with emperors and kings, finding Charlemagne a rising power, wrote a letter to him exhorting him to imitate the liberality and revive the name of the great Constantine. He used for that purpose a legend for which he vouched, and which was to this effect: The first of the Christian emperors was healed of the leprosy, and purified in the waters of baptism by St. Sylvester, the Roman bishop, and the physician was gloriously recompensed, for that emperor withdrew from the seat and patrimony of St. Peter, declared his resolution of founding a new capital in the East, and resigned to the Popes the free and perpetual sovereignty of Rome, Italy, and the provinces of the West. By this plausible story it was made to appear that the Popes were made by the best of titles supreme; and such were the ignorance and credulity of the times, that this absurd fable was received with equal reverence in Greece and France. It turned out that the story was a forgery concocted near the end of the eighth century by one Isidore, a scribe. It was, nevertheless, accepted and handed down as a _magna charta_ of papal rights, until some opposition to its authenticity proceeded from a Sabine monastery about 1100. In the revival of letters, an eloquent critic and Roman patriot, named Laurentius Valla, who died 1457, completed the exposure of the forgery, to the amazement of his contemporaries, and before the end of the next age the imposture was rejected with the contempt of all the historians. But it served its purpose. As Gibbon observes, "The Popes themselves have indulged a smile at the credulity of the vulgar, but a false obsolete title still sanctifies their reign; and by the same fortune which has attended these forged decretals, and the Sibylline oracles, the edifice has subsisted after the foundations have been undermined." POPE NICOLAS AND THE FALSE DECRETALS (867).