Since the attempt of Turgesius to subvert the religion of the country, they never showed the slightest inclination to repeat it; hence they were left in quiet possession of the places which they occupied on the sea-board, and gradually came to embrace Christianity themselves.
Little is known of the circumstances which attended this change of religion on their part; and it is certain that it did not take place till late in the tenth century. Some pretend that Christianity was brought to them from their own country, where it had already been planted by several missionaries and bishops. But it is known that St. Ancharius, the first apostle of Denmark, could not establish himself permanently in that country, and had to direct a few missionaries from Hamburgh, where he fixed his see. It is known, moreover, that Denmark was only truly converted by Canute in the eleventh century, after his conquest of England. As to Norway, the first attempt at its conversion by King Haquin, who had become a Christian at the court of Athelstan in England, was a failure; and although his successor, Harold, appeared to succeed better for a time, paganism was again reestablished, and flourished as late as 995. It was, in fact, Olaf the Holy who, coming from England, in 1017, with the priests Sigefried, Budolf, and Bernard, succeeded in introducing Christianity permanently into Norway, and he made more use of the sword than of the word in his mission.
With regard to the conversion of the Danes in Ireland, it seems that, after all, it was the ever-present spectacle of the workings of Christianity among the Irish which gradually opened their eyes and ears. They came to love the country and the people when they knew them thoroughly; they respected them for their bravery, which they had proved a thousand times; they felt attracted toward them on account of their geniality of temperament and their warm social feelings; even their defects of character and their impulsive nature were pleasing to them. They soon sought their company and relationship; they began to intermarry with them; and from this there was but a step to embracing their religion.
The Danes of Waterford, Cork, and Limerick were, however, the last to abandon paganism, and they seem not to have done so until after Clontarf.
It is very remarkable that, during all those conflicts of the Irish with the Danes, when the Northmen strewed the island with dead and ruins; when they seemed to be planting their domination in the Orkneys, the Hebrides, and even the Isle of Man, on a firm footing; when the seas around England and Ireland swarmed with pirates, and new expeditions started almost every spring from the numerous harbors of the Baltic—the Irish colony of Dal Riada in Scotland, which was literally surrounded by the invaders, succeeded in wresting North Britain from the Picts, drove them into the Lowlands, and so completely rooted them out, that history never more speaks of them, so that to this day the historical problem stands unsolved— What became of the Picts?— various as are the explanations given of their disappearance. And, what is more remarkable still, is, that the Dal Riada colony received constant help from their brothers in Erin, and the first of the dynasty of Scottish kings, in the person of Kenneth McAlpine, was actually set on the throne of Scotland by the arms of the Irish warriors, who, not satisfied apparently with their constant conflicts with the Danes on their own soil, passed over the Eastern Sea to the neighboring coast of Great Britain.
During the last forty years of the tenth century the Danes lived in Ireland as though they belonged to the soil. If they waged war against some provincial king, they became the allies of others. When clan fought clan, Danes were often found on both sides, or if on one only, they soon joined the other. They had been brought to embrace the manners of the natives, and to adopt many of their customs and habits. Yet there always remained a lurking distrust, more or less marked, between the two races; and it was clear that Ireland could never be said to have escaped the danger of subjugation until the Scandinavian element should be rendered powerless.
This antipathy on both sides existed very early even in Church affairs, the Christian natives being looked upon with a jealous eye by the Christian Danes; so that, toward the middle of the tenth century, the Danes of Dublin having succeeded in obtaining a bishop of their own nation, they sent him to England to be consecrated by Lanfranc, the Archbishop of Canterbury, and for a long time the see of Dublin was placed under the jurisdiction of Lanfranc's successors.
This grew into a serious difficulty for Ireland, as the capital of Leinster began to be looked upon as depending, at least spiritually, on England; and later on, at the time of the invasion under Strongbow, the establishment of the English Pale was considerably facilitated by such an arrangement, to which Rome had consented only for the spiritual advantage of her Scandinavian children in Ireland.
And the Irish were right in distrusting every thing foreign on the soil, for, even after becoming Christians, the Danes could not resist the temptation of making a last effort for the subjugation of the country.
Hence arose their last general effort, which resulted in their final overthrow at Clontarf. It does not enter into our purpose to give the story of that great event, known in all its details to the student of Irish history. It is not for us to trace the various steps by which Brian Boru mounted to supreme power, and superseded Malachi, to relate the many partial victories he had already gained over the Northmen, nor to allude to his splendid administration of the government, and the happiness of the Irish under his sway.