decisive battle of Clontarf, in which the saintly and victorious Brian Boru was slain, saved Ireland to Christendom and curbed the power of the heathen invaders. A second wave of Norse invasion swept over England at the Norman Conquest, and for a time submerged the native English population. The chivalrous Norman knights who followed William of Normandy's sacred banner, whether from religious zeal or desire of plunder, were as truly Vikings by race as were the Danes who settled in the Danelagh. The days when Rolf (Rollo, or Rou), the Viking chief, won Normandy were not yet so long gone by that the fierce piratical instincts of his followers had ceased to influence their descendants: piety and learning, feudal law and custom, had made some impression upon the character of the Norman, but at heart he was still a Northman. The Norman barons fought for their independence against Duke William with all the determination of those Norse chiefs who would not acknowledge the overlordship of Harold Fairhair, but fled to colonise Iceland when he made himself King of Norway. The seafaring instincts which drove the Vikings to harry other lands in like manner drove the Normans to piratical plundering up and down the English Channel, and, when they had settled in England, led to continual sea-fights in the Channel between English and French, hardy Kentish and Norman, or Cornish and Breton, sailors, with a common strain of fighting blood, and a common love of the sea. The Norman Conquest of England was but one instance of Norman activity: Sicily, Italy, Constantinople, even Antioch, and the Holy Land itself, showed in time Norman states, Norman laws, Norman civilisation, and all alike felt the impulse of Norman energy and inspiration. England lay ready to hand for Norman invasion--the hope of peaceable succession to the saintly Edward the Confessor had to be abandoned by William; the gradual permeation of sluggish England with Norman earls, churchmen, courtiers, had been comprehended and checked by Earl Godwin and his sons (themselves of Danish race); but there still remained the way of open war and an appeal to religious zeal; and this way William took. There was genius as well as statesmanship in the idea of combining a personal claim to the throne held by Harold the usurper with a crusading summons against the schismatic and heretical English, who refused obedience to the true successor of St. Peter. The success of the idea was its justification: the success of the expedition proved the need that England had of some new leaven to energise the sluggish temperament of her sons. The Norman Conquest not only revived and quickened, but unified and solidified the English nation. The tyranny of the Norman nobles, held in check at first only by the tyranny of the Norman king, was the factor in mediæval English life that made for a national consciousness; it also helped the appreciation of the heroism of revolt against tyranny which is seen in