The intellectual labours of the Irish schools, besides the task of teaching such immense numbers of men of all nations on their own soil, and the missionary conquests to which I have barely alluded, were diversified by controversies, partly scientific and partly theological—such as the "Easter Controversy," the "Tonsure Controversy," and that maintained by "Feargal the Geometer," as to the existence of the Antipodes.

The discussion, as to the proper time of observing Easter, which had occupied the doctors of the Council of Nice in the fourth century, was raised in Ireland and in Britain early in the sixth, and complete uniformity was not established till far on in the eighth. It occupied the thoughts of several generations of the chief men of the Irish Church, and some of their arguments still fortunately survive, to attest their learning and tolerance, as well as their zeal. St. Patrick had introduced in the fifth century the computation of time then observed in Gaul, and to this custom many of the Irish doctors rigidly adhered, long after the rest of Christendom had agreed to adopt the Alexandrian computation. Great names were found on both sides of the controversy: Columbanus, Finian, and Aidan, for adhering exactly to the rule of St. Patrick; Cummian, the White, Laserian and Adamnan, in favour of strict agreement with Rome and the East. Monks of the same Monastery and Bishops of the same Province maintained opposite opinions with equal ardour and mutual charity. It was a question of discipline, not a matter of faith; but it involved a still greater question, whether national churches were to plead the inviolability of their local usages, even on points of discipline, against the sense and decision of the Universal Church.

In the year of our Lord 630, the Synod of Leighlin was held, under the shelter of the ridge of Leinster, and the presidency of St. Laserian. Both parties at length agreed to send deputies to Rome, as "children to their mother," to learn her decision. Three years later, that decision was made known, and the midland and southern dioceses at once adopted it. The northern churches, however, still held out, under the lead of Armagh and the influence of Iona, nor was it till a century later that this scandal of celebrating Easter on two different days in the same church was entirely removed. In justification of the Roman rule, St. Cummian, about the middle of the seventh century, wrote his famous epistle to Segenius, Abbot of Iona, of the ability and learning of which all modern writers from Archbishop Usher to Thomas Moore, speak in terms of the highest praise. It is one of the few remaining documents of that controversy. A less vital question of discipline arose about the tonsure. The Irish shaved the head in a semicircle from temple to temple, while the Latin usage was to shave the crown, leaving an external circle of hair to typify the crown of thorns. At the conference of Whitby (A.D. 664) this was one of the subjects of discussion between the clergy of Iona, and those who followed the Roman method—but it never assumed the importance of the Easter controversy.

In the following century an Irish Missionary, Virgilius, of Saltzburgh, (called by his countrymen "Feargal, the Geometer,") was maintaining in Germany against no less an adversary than St. Boniface, the sphericity of the earth and the existence of antipodes. His opponents endeavoured to represent him, or really believed him to hold, that there were other men, on our earth, for whom the Redeemer had not died; on this ground they appealed to Pope Zachary against him; but so little effect had this gross distortion of his true doctrine at Rome, when explanations were given, that Feargal was soon afterwards raised to the See of Saltzburgh, and subsequently canonized by Pope Gregory IX. In the ninth century we find an Irish geographer and astronomer of something like European reputation in Dicuil and Dungal, whose treatises and epistles have been given to the press. Like their compatriot, Columbanus, these accomplished men had passed their youth and early manhood in their own country, and to its schools are to be transferred the compliments paid to their acquirements by such competent judges as Muratori, Latronne, and Alexander von Humboldt. The origin of the scholastic philosophy—which pervaded Europe for nearly ten centuries—has been traced by the learned Mosheim to the same insular source. Whatever may now be thought of the defects or shortcomings of that system, it certainly was not unfavourable either to wisdom or eloquence, since among its professors may be reckoned the names of St. Thomas and St. Bernard.

We must turn away our eyes from the contemplation of those days in which were achieved for Ireland the title of the land of saints and doctors. Another era opens before us, and we can already discern the long ships of the north, their monstrous beaks turned towards the holy Isle, their sides hung with glittering shields and their benches thronged with fair-haired warriors, chanting as they advance the fierce war songs of their race. Instead of the monk's familiar voice on the river banks we are to hear the shouts of strange warriors from a far-off country; and for matin hymn and vesper song, we are to be beset through a long and stormy period, with sounds of strife and terror, and deadly conflict.

BOOK II.

CHAPTER I.
THE DANISH INVASION.

Hugh VI., surnamed Ornie, succeeded to the throne vacant by the death of Donogh I. (A.D. 797), and reigned twenty-two years; Conor II. succeeded (A.D. 819), and reigned fourteen years; Nial III. (called from the place of his death Nial of Callan), reigned thirteen years; Malachy I. succeeded (A.D. 845), and reigned fifteen years; Hugh VII. succeeded and reigned sixteen years (dying A.D. 877); Flan (surnamed Flan of the Shannon) succeeded at the latter date, and reigned for thirty-eight years, far into the tenth century. Of these six kings, whose reigns average twenty years each, we may remark that not one died by violence, if we except perhaps Nial of Callan, drowned in the river of that name in a generous effort to save the life of one of his own servants. Though no former princes had ever encountered dangers equal to these—yet in no previous century was the person of the ruler so religiously respected. If this was evident in one or two instances only, it would be idle to lay much stress upon it; but when we find the same truth holding good of several successive reigns, it is not too much to attribute it to that wide diffusion of Christian morals, which we have pointed out as the characteristic of the two preceding centuries. The kings of this age owed their best protection to the purer ethics which overflowed from Armagh and Bangor and Lismore; and if we find hereafter the regicide habits of former times partially revived, it will only be after the new Paganism—the Paganism of interminable anti-Christian invasions—had recovered the land, and extinguished the beacon lights of the three first Christian centuries.

The enemy, who were now to assault the religious and civil institutions of the Irish, must be admitted to possess many great military qualities. They certainly exhibit, in the very highest degree, the first of all military virtues—unconquerable courage. Let us say cheerfully, that history does not present in all its volumes a braver race of men than the Scandinavians of the ninth century. In most respects they closely resembled the Gothic tribes, who, whether starting into historic life on the Euxine or the Danube, or faintly heard of by the Latins from the far off Baltic, filled with constant alarm the Roman statesmen of the fourth century; nor can the invasions of what we may call the maritime Goths be better introduced to the reader than by a rapid sketch of the previous triumphs of their kindred tribes over the Roman Empire.

It was in the year of our Lord 378 that these long-dreaded barbarians defeated the Emperor Valens in the plain of Adrianople, and as early as 404—twenty-six years after their first victory in Eastern Europe—they had taken and burned great Rome herself. Again and again—in 410, in 455, and in 472—they captured and plundered the Imperial City. In the same century they had established themselves in Burgundy, in Spain, and in Northern Africa; in the next, another branch of the Gothic stock twice took Rome; and yet another founded the Lombard Kingdom in Northern Italy. With these Goths thus for a time masters of the Roman Empire, whose genius and temper has entered so deeply into all subsequent civilization, war was considered the only pursuit worthy of men. According to their ideas of human freedom, that sacred principle was supposed to exist only in force and by force; they had not the faintest conception, and at first received with unbounded scorn the Christian doctrine of the unity of the human race, the privileges and duties annexed to Christian baptism, and the sublime ideal of the Christian republic. But they were very far from being so cruel or so faithless as their enemies represented them; they were even better than they cared to represent themselves. And they had amongst them men of the highest capacity and energy, well worthy to be the founders of new nations. Alaric, Attila, and Genseric, were fierce and unmerciful it is true; but their acts are not all written in blood; they had their better moments and higher purposes in the intervals of battle; and the genius for civil government of the Gothic race was in the very beginning demonstrated by such rulers as Theodoric in Italy and Clovis in Gaul. The rear guard of this irresistible barbaric invasion was now about to break in upon Europe by a new route; instead of the long land marches by which they had formerly concentrated from the distant Baltic and from the tributaries of the Danube, on the capital of the Roman empire; instead of the tedious expeditions striking across the Continent, hewing their paths through dense forests, arrested by rapid rivers and difficult mountains, the last northern invaders of Europe had sufficiently advanced in the arts of shipbuilding and navigation to strike boldly into the open sea and commence their new conquests among the Christian islands of the West. The defenders of Roman power and Christian civilization in the fifth and sixth centuries, were arrayed against a warlike but pastoral people encumbered with their women and children; the defenders of the same civilization, in the British Islands in the ninth and tenth centuries, were contending with kindred tribes, who had substituted maritime arts and habits for the pastoral arts and habits of the companions of Attila and Theodoric. The Gothic invasion of Roman territory in the earlier period was, with the single exception of the naval expeditions of Genseric from his new African Kingdom, a continental war; and notwithstanding the partiality of Genseric for his fleet, as an arm of offence and defence, his companions and successors abandoned the ocean as an uncongenial element. The only parallel for the new invasion, of which we are now to speak, is to be found in the history and fortunes of the Saxons of the fifth century, first the allies and afterwards the conquerors of part of Britain. But even their descendants in England had not kept pace, either in the arts of navigation or in thirst for adventure, with their distant relatives, who remained two centuries later among the friths and rocks of Scandinavia.