The stipulated peace between the natives of Galicia and the Sueves[43] having been broken, the former commissioned Idatius to represent their case to the general Aecius. He set out for Gaul upon this errand in the year 431, and returned to Galicia the following year, accompanied by Count Censorius, the ambassador sent by Aecius to try and induce Hermanricus II to make a fresh peace. But Censorius being called to Rome by the Empress Placidia before this had been accomplished, the negotiations were left in the hands of Idatius and several other bishops. “Great,” says Dr. Macias, “were the services which upon this critical occasion Idatius rendered to his country”, but this is not by any means his only title to honour. Galicia was at that juncture not only overrun by barbarians but perturbed by heretics, and Idatius played no mean part in the struggle that was sustained between Arianism[44] and the Sueves, and which was more serious against the doctrines of Priscillian, which had by that time taken such deep root in Galicia, “a struggle obscure but heroic,” said Menendez y Pelayo, “which must have left some records behind it; but the torments endured by human thought and by the conscience are those which are the least reflected in the pages of history. What long accounts of conquests and battles, what innumerable catalogues of dynasties would we not gladly relinquish that we might know when and how the heresy of Priscillian disappeared from among the people of Galicia!”[45] But we will leave the subject of the persecution of the Priscillianists to another volume, and turn our attention at present to the writings of Idatius. The greatness of his name is due to the chronicles he left behind him,[46] and not to his religious zeal. Historians have pronounced them to be a literary production of the greatest importance, not only because they are the oldest historical documents possessed by Spain and because they testify to Spain’s having been one of the earliest among the nations to cultivate history, but also on account of the quality of the facts recorded. Florez calls them “an original source from which we may learn the events connected with the entrance of the Vandals, the Alanes, and the Sueves into Spain.” The fifth century would indeed be, historically, almost blank but for the light that is thrown upon its events by the chronicles of Idatius. St. Jerome, the translator and continuer of the history begun by Eusebius of Cæsarea, did not get farther than the year 378, everything having been thrown into confusion by the invasion of the barbarians. This, says Macias, was the point at which Idatius took up the thread. His chronicles begin with the following year, 379, the first year of the reign of Theodosius, and end in the year 469, thus embracing the events of ninety-one years. Idatius witnessed and took part in many of the events he recorded. Being, as he himself said, cognisant of all the calamities of his unfortunate epoch, he relates with truthfulness the invasion of Galicia by the Sueves, and paints their methods of raiding the country with the most lively colours. But for him the Spaniards would to-day be in ignorance of many of the facts which later historians--St. Isidore, and Rodrigo, Archbishop of Toledo, and others--have handed down, for they constantly copied word for word from the chronicles of Idatius.