These rash and violent proceedings gave great scandal to the faithful of the diocese. They were divided into two factions; for the bishop had numerous partisans of his own, but they were in a minority; and on one occasion the prelate very narrowly escaped being torn to pieces by the mob. The wily Claudius, however, by his representations to the emperor, in which he threw all the blame on the turbulence of the superstitious Lombards, succeeded in maintaining his ground.

About A.D. 824 a friend of his, the pious Abbot Theodemir, wrote a remonstrance to Claudius on his proceedings, in which he adjured him, by the memory of their former friendship, to discontinue these odious proceedings, reminding him how unworthy it was of a Christian bishop to dishonour the Saints of God, to insult the Cross of Christ, and break the images of His saints and martyrs.

This gentle remonstrance only made the Iconoclast more furious. He wrote a reply to the holy abbot, a considerable portion of which has come down to us, and shows Claudius in his true colours.

It is entitled—“Apologeticum atque Rescriptum Claudii Episcopi adversus Theutmirum Abbatem.”

It was this work brought out Dungal. He had hitherto been much pained at the proceedings of Claudius; for being then in Pavia he could scarcely be ignorant of what took place in Turin. Most of the French prelates, however, themselves more or less infected with unsound doctrine, held aloof; and even Agobard of Lyons wrote in favour of Claudius, so Dungal, although probably only a deacon, if, indeed, at all in holy orders, felt it his duty to come forward as the champion of the truth. He got his teaching not in France or Germany, but in Ireland; so he was not tainted with the errors of the Frankish theologians.

Dungal’s treatise against Claudius is entitled: “Dungali Responsa contra Perversas Claudii Taurinensis Episcopi Sententias.”

In the prologue of the book Dungal declares that for God’s honour, and with the sanction of Louis and his son Lothaire, he undertakes to defend, on the authority of the Holy Fathers, the Catholic doctrine against the frantic and blasphemous trifling of Claudius, Bishop of Turin. Many times since his arrival in Italy he had just cause to complain, whilst he saw the field of the Lord oversown with tares, yet he held his peace in grief and pain. He can, however, do so no longer, when he sees the Church distracted, and the people seduced by deceivers. He first sets forth very clearly the points at issue between the rival parties, and then proceeds to refute Claudius, and prove the Catholic doctrine, observing at the outset that it was astonishing insolence for any man to presume to “censure and blaspheme that doctrine and practice which for 820 years or more was followed by the blessed Fathers, by most religious princes, and by all Christian households up to the present time.”

After proving that these practices were not only not forbidden, but sanctioned by God Himself in the Pentateuch, he goes on to establish this tradition of the Catholic Church, quoting most of the Greek and Latin fathers, the poems of Paulinus, Prudentius, and Fortunatus, the Acts of the Martyrs and the Liturgy of the Church. He quotes, moreover, the Apocalypse, the Gospels, the Acts of the Apostles, at great length, to prove the same doctrine, and alleges that it was the universal belief and practice in the East and in the West from the days of the Apostles down to his own time. The Greeks lately erred; but their errors were retracted and condemned.

It is impossible not to admire the great knowledge of Sacred Scripture and Patristic literature displayed by the author. He reasons, too, clearly and cogently; and writes in a limpid and flowing style. Indeed, we know no writer of that age who excels Dungal in Latin composition, whether in poetry or prose; and this is generally admitted by those acquainted with the Latin literature of the period. Muratori observes that this work shows that Dungal was a man of wide culture.[311] This is high testimony from such an authority. Papirius Massonus, in his address to the prelates and clergy of Gaul prefixed to the treatise of Dungal, calls him an excellent theologian—Theologus excellens—and Alzog declares that the sophistical reasoning of Claudius, Bishop of Turin, was refuted by Jonas, Bishop of Orleans, but much more ably by Dungal, an Irish monk of St. Denys, and subsequently by Strabo and Hincmar of Rheims.

Dungal’s was not only the ablest, but also the first work that was written on the subject; for in it he alludes to the Synod or Conference of Paris in A.D. 825, as held two years before. So it must have appeared in A.D. 827, long before the refutations published by Jonas, Eginhard, Strabo, or Hincmar. Henceforward Iconoclasm began to lose ground in the West; and soon entirely disappeared, until revived in the sixteenth century.