Agobard maintains that this is the work of God alone; that in truth, the saints, with the help of God, have often performed similar prodigies; but that neither the devil nor sorcerers can do anything like it. He remarks that there were among his people superstitious persons who would pay very punctually what they called _canonicum_, which was a sort of tribute which they offered to these tempest-brewers (_tempetiers_), that they might not hurt them, while they refused the tithe to the priest and alms to the widow, orphan, and other indigent persons. He adds that he had of late found people sufficiently foolish enough to spread a report that Grimaldus, Duke of Benevento, had sent persons into France, carrying certain powders which they had scattered over the fields, mountains, meadows, and springs, and had thus caused the death of an immense number of animals. Several of these persons were taken up, and they owned that they carried such powders about with them and though they made them suffer various tortures, they could not force them to retract what they had said. Others affirmed that there was a certain country named Mangonia, where there were vessels which were borne through the air and took away the productions; that certain wizards had cut down trees to carry them to their country. He says, moreover, that one day three men and a woman were presented to him, who, they said, had fallen from these ships which floated in the air. They were kept some days in confinement, and at last having been confronted with their accusers, the latter were obliged, after contesting the matter, and making several depositions, to avow that they knew nothing certain concerning their being carried away, or of their pretended fall from the ship in the sky. Charlemagne[214] in his Capitularies, and the authors of his time, speak also of these wizard tempest-brewers, enchanters, &c., and commanded that they should be reprimanded and severely chastised. Pope Gregory IX.[215] in a letter addressed to the Archbishop of Mayence, the Bishop of Hildesheim, and Doctor Conrad, in 1234, thus relates the abominations of which they accused the heretic _Stadingians_. "When they receive," says he, "a novice, and when he enters their assemblies for the first time, he sees an enormous toad, as big as a goose, or bigger. Some kiss it on the mouth, some kiss it behind. Then the novice meets a pale man with very black eyes, and so thin that he is only skin and bones. He kisses him, and feels that he is cold as ice. After this kiss, the novice easily forgets the Catholic faith; afterwards they hold a feast together, after which a black cat comes down behind a statue, which usually stands in the room where they assemble.