While the Norse foreigners were a power at Dublin, Waterford, Cork and Limerick, there were not wanting occasions when one of the native tribes called on them for aid against another tribe, sharing with them the joys of victory or the sorrow of defeat, and, where fortune favored, dividing with them the "countless cows" taken in a raid. In like manner the Cinel Eogain, as we saw, hired the fleet of the Norsemen of the Western Isles of Scotland to help them to resist a raid of the Connachtmen. The example thus set was followed repeatedly in the coming years, and we find mention of Flemings, Welshmen and Saxons brought over to take one side or other in the tribal wars. In the same year that saw the two assemblings of the chieftains under Ruaidri Ua Concobar, another chieftain, Diarmaid son of Murcad brought in from "the land of the Saxons," as it was called, one of these bands of foreign mercenaries, for the most part Welsh descendants of the old Gaelic Britons, to aid him in his contest for "the kingdom of the sons of Ceinnsealaig." Two years later, Ruaidri Ua Concobar "granted ten cows every year from himself and from every king that should follow him for ever, to the Lector of Ard Maca, in honor of Patrick, to instruct the youths of Ireland and Alba in Literature." For the next year, 1170, we find this record: "Robert Mac Stepni and Ricard Mac Gillebert--Iarl Strangbow--came from Saxonland into Erin with a numerous force, and many knights and archers, in the army of the son of Murcad, to contest Leinster for him, and to disturb the Gaels of Erin in general; and the son of Murcad gave his daughter to Iarl Strangbow for coming into his army. They took Loch Garman--Wexford--and Port Lairge--Waterford--by force; and they took Gillemaire the officer of the fortress and Ua Faelain lord of the Deisi and his son, and they killed seven hundred persons there. Domnall Breagac with numbers of the men of Breag fell by the Leinstermen on that occasion. An army was led by Ruaidri Ua Concobar with the lord of Breifne and the lord of Oirgialla against Leinster and the Foreigners aforesaid, and there was a challenge of battle between them for the space of three days." This contest was indecisive. The most noteworthy event of the battle was the plundering and slaughter of the Danes of At-Cliat by the newcomers under Iarl Strangbow. The Danes had long before this given up their old pagan faith, converted by their captives and their Gaelic neighbors. Christ Church Cathedral in At-Cliat or Dublin was founded early in the preceding century by Sitric son of Olaf, king of the Danes of Dublin, and Donatus the first Danish bishop; but the oldest part of the present structure belongs to the time we are now speaking of: the close of the twelfth century. The transepts with their chevron mouldings and the principal doorway are of that period, and we may regard them as an offering in expiation of the early heathen raids on Lambay, Saint