Thus the authentic elements were calculated to serve as a passport for the forgeries, which were, moreover, quite skilfully composed. In fact, the collection thus blended was passed from hand to hand without meeting with any opposition. At most all that was asked was whether those decretals which did not appear in the _Liber canonum_ (the collection of Dionysius Exiguus, accepted in France) had the force of law, but Pope Nicholas having answered that all the pontifical letters had the same authority (see _Decr. Gra._ Dist. xix. c. 1), they were henceforward accepted, and passed in turn into the later canonical collections. No doubts found an expression until the 15th century, when Cardinal Nicholas of Cusa (d. 1464) and Juan Torquemada (d. 1468) freely expressed their suspicions. More than one scholar of the 16th century, George Cassander, Erasmus, and the two editors of the _Decretum_ of Gratian, Dumoulin (d. 1568) and Le Conte (d. 1577), decisively rejected the False Decretals. This contention was again upheld, in the form of a violent polemic against the papacy, by the Centuriators of Magdeburg (_Ecclesiastica historia_, Basel, 1559-1574); the attempt at refutation by the Jesuit Torres (_Adversus Centur. Magdeburg. libri quinque_, Florence, 1572) provoked a violent rejoinder from the Protestant minister David Blondel (_Pseudo-Isidorus et Turrianus rapulantes_, Geneva, 1620). Since then, the conclusion has been accepted, and all researches have been of an almost exclusively historical character. One by one the details are being precisely determined, and the question may now almost be said to be settled.
In the first place, an exact determination of the date of the collection has been arrived at. On the one hand, it cannot go back further than 847, the date of the False Capitularies, with which the author of the False Decretals was acquainted.[1] On the other hand, in a letter of Lupus, abbot of Ferrières, written in 858, and in the synodical letter of the council of Quierzy in 857 are to be found quotations which are certainly from these false decretals; and further, an undoubted allusion in the statutes given by Hincmar to his diocese on the 1st of November 852. The composition of the collection must then be dated approximately at 850.