The social and political system of Ireland was powerless either to expel or to absorb the foreign element thus introduced within its borders. Not only was such an union of the two peoples as had at last been effected in England simply impossible in Ireland; the Irish Danelaw was parted from its Celtic surroundings by barriers of race and speech, of law and custom and institutions, far more insuperable than those which parted the settlers in the “northman’s land” at the mouth of Seine from their West-Frankish neighbours. Even the Irish Church, which three hundred years before had won half England--one might add half Europe--to the Faith, had as yet failed to convert these pagans seated at her door. At the close of the tenth century the Ostmen were still for the most part heathens in fact if not in name, aliens from whatever culture or civilization might still remain in the nation around them. Meanwhile their relations with England had wholly altered in character. The final submission of the English Danelaw to Eadred carried with it the alliance of the Irish Danelaw; it seems that the Ostmen in their turn endeavoured to strengthen themselves against the attacks of the Irish princes by securing a good understanding with the English king, if not actually by putting themselves under his protection; for the fact that Eadgar coined money in Dublin[381] indicates that his authority must have been in some way or other acknowledged there. The years of the Ostmen’s struggle with Malachi and Brian Boroimhe were the years of England’s struggle with Swein and Cnut; but the two strifes seem to have been wholly unconnected; and throughout the long peace which lasted from Cnut’s final triumph until the coming of the Normans, new ties sprang up between the Ostmen and the sister-isle. Owing to their position on the sea-coast and to the spirit of merchant enterprise which was, quite as much as the spirit of military enterprise, a part of the wiking-heritage of their inhabitants, the towns of the Irish Danelaw rose fast into importance as seats of a flourishing trade with northern Europe, and above all with England through its chief seaports in the west, Bristol and Chester. The traffic was chiefly in slaves, bought or kidnapped in England to be sold to the merchants of Dublin or Waterford, and by these again to their Irish neighbours or to traders from yet more distant lands.[382] Horrible as this traffic was, however, even while filling the Irish coast-towns with English slaves it helped to foster a more frequent intercourse and a closer relation between Ostmen and Englishmen; and the shelter and aid given to Harold and Leofwine in 1151 by Dermot Mac-Maelnambo,[383] a prince of the royal house of Leinster who had acquired the sovereignty over both Leinstermen and Danes, shews that the political alliance established in Eadgar’s day had been carefully renewed by Godwine. [381] Green, _Conquest of England_, p. 323.