From the death of Constantine, however, the study began rapidly to decline, even among ecclesiastics. The disruption of the Empire naturally tended to diminish the intercourse between East and West, and by consequence the interchange of their languages. It would appear, too, as if the barbarian conquerors adopted, in favour of their own languages, the same policy which the Romans had pursued for Latin. Attila is said to have passed a law prohibiting the use of the Latin language in his newly conquered kingdom,[21] and to have taken pains, by importing native teachers, to procure the substitution of Gothic in its stead. At all events, in whatever way the change was brought about, a knowledge of both Greek and Latin, which in the classic times of the Empire had been the ordinary accomplishment of every educated man, became uncommon and almost exceptional. Pope Gregory the Great, who, bitterly as he has been assailed as an enemy of letters, must be confessed to have been the most eminent Western scholar of his day, spoke Greek very imperfectly; he complains that it was difficult, even at Constantinople, to find any one who could translate Greek satisfactorily into Latin;[22] and a still earlier instance is recorded, in which a pope, in other respects a man of undoubted ability, was unable to translate the letter of the Greek patriarch, much less to communicate with the Greek ambassadors, except through an interpreter.[23] More than one, indeed, of the early theological controversies was embittered through the misunderstandings caused between the East and West by mutual ignorance of each other’s language. Pelagius succeeded in obtaining a favourable decision from the Council of Jerusalem in 415, chiefly because, while his Western adversary, Orosius, was unable to speak Greek, the fathers of the Council were ignorant of Latin. The protracted controversy on the Three Chapters owed much of its inveteracy to the ignorance of the Westerns[24] of the original language of the works whose orthodoxy was impugned; and it is well known that the condemnation of the decree of the sixth council on the use of sacred images issued by the fathers of Francfort, was based exclusively on a strangely erroneous Latin translation of the acts of the council, through which translation alone they were known in Germany and Gaul.[25]