The earliest legal allusion to this form of ordeal in Europe occurs in the code of the Ripuarian Franks, where it is prescribed as applicable to slaves and strangers, in some cases of doubt.[974] From the phraseology of these passages, we may conclude that it was then administered by placing the hand of the accused in a fire. As a legal ordeal this is perhaps the only allusion to it in European jurisprudence, but it was repeatedly resorted to by enthusiasts as a voluntary trial for the purpose of establishing the truth of accusations or of substantiating their position. In these cases it was conducted on a larger and more impressive scale; huge pyres were built, and the individual undergoing the trial literally walked through the flames, as Siawush did. The celebrated Petrus Igneus gained his surname and reputation by an exploit of this kind, which was renowned in its day. Pietro di Pavia, Bishop of Florence, unpopular with the citizens, but protected by Godfrey, Duke of Tuscany, was accused of simony and heresy. Being acquitted by the Council of Rome, in 1063, and the offer of his accusers to prove his guilt by the ordeal of fire being refused, he endeavored to put down his adversaries by tyranny and oppression. Great disturbances resulted, and at length, in 1067, the monks of Vallombrosa, who had borne a leading part in denouncing the bishop, and who had suffered severely in consequence (the episcopal troops having burned the monastery of St. Salvio and slaughtered the cenobites), resolved to decide the question by the ordeal, incited thereto by no less than three thousand enthusiastic Florentines who assembled there for the purpose. Pietro Aldobrandini, a monk of Vallombrosa, urged by his superior, the holy S. Giovanni Gualberto, offered himself to undergo the trial. After imposing religious ceremonies, he walked slowly between two piles of blazing wood, ten feet long, five feet wide, and four and a half feet high, the passage between them being six feet wide and covered with an inch or two of glowing coals. The violence of the flames agitated his dress and hair, but he emerged without hurt, even the hair on his legs being unsinged, barelegged and barefooted though he was. Desiring to return through the pyre, he was prevented by the admiring crowd, who rushed around him in triumph, kissing his feet and garments, and endangering his life in their transports, until he was rescued by his fellow monks. A formal statement of the facts was sent to Rome by the Florentines, the papal court gave way, and the bishop was deposed; while the monk who had given so striking a proof of his steadfast faith was marked for promotion, and eventually died Cardinal of Albano.[975]