Apart from this imperial ecclesiastical principle the latter episode is especially interesting on account of the character of the evidence produced by the Pope to maintain his position. This evidence consisted of a new compilation of Church law which appeared somewhat mysteriously about this time. Theretofore Church law had consisted of a collection of precepts taken from the Bible, from the early Fathers, from decrees of Councils, and also of letters, called decretals, written by the bishops of Rome, but none of these decretals was earlier than the time of Constantine. The fact, that there were no papal decretals prior to Constantine, seemed to imply, at least to the sceptically minded, that papal authority had really begun at the time of Constantine and not at the time of St. Peter. To the ardent papist such an idea was incredible. Nicholas now produced a new batch of documents. Among these was the _Donation of Constantine_, of which I have spoken. Others were papal decretals, which purported to come from Popes of the third and second centuries, and to prove that papal jurisdiction over other bishoprics had been exercised almost as far back as the time of St. Peter. These new appearing documents placed the Pope not only above kings, but above metropolitans and provincial synods, and justified Nicholas in acting directly in the case of the West Frankish bishop, in the King of Lorraine's matrimonial affairs, and also in assuming to act as "imperator of the whole world." These documents, known as the _Isidorian Decretals_, were probably composed by some priest in France, not long before their use by Nicholas. For six hundred years they were believed to be genuine, and during that time rendered the Papacy great service by ranging the sentiment of law throughout Europe (at least until the revival of Roman law) on the side of the Papacy in its struggle with the Empire. CHAPTER VIII THE DEGRADATION OF ITALY (867-962) These triumphs were due to the brilliant vigour of Pope Nicholas; but that triumphant position could not last, it was fictitious. The Papacy needed the support of a strong secular power, and when the Carlovingian Empire dissolved, it had nothing to rest on, neither genius nor military force, and fell into deep degradation.