It is curious, and for the Irish a source of very legitimate pride, that of all the countries attacked by the Northmen, they got the hardest blows and the most terrible, as well as the most frequent, defeats in Ireland. They seem to have made more frequent attacks on it than on any other country, and to have poured more men into it than into any other country. This appears not only from Irish annals and history, but from Icelandic literature, which was the common property of all the Scandinavian nations, and the only literature in which the doings of the Vikings are recorded by writers who were nearly contemporary with them. There appears to be more written about Ireland and its people in the Icelandic Sagas than about any other country or people the Vikings harried. The terrible defeat the Northmen suffered at Clontarf in 1014 is fully acknowledged in the Icelandic Sagas. It must, however, in truth be admitted that that battle, while it turned out to be a national one, originated in a family quarrel, and was brought about, as many battles had been brought about before, by a bad and beautiful woman. If Gormfhlaith and King Brian had not quarrelled, if Broder had not been desperately enamoured of her, and if she had not been of the royal blood of the terribly maltreated and so often ravaged province of Leinster, the battle of Clontarf never would have been fought. Brian was an elderly man when he became over-king, and was quite willing to allow the Danes to hold Dublin and other sea-ports as trading points, for after a time they became traders and carriers. He was willing to let them alone provided that they let him alone. This is proved by his having given one of his daughters in marriage to Sitric, the Danish King or Governor of Dublin. The Danes, knowing they had the entire strength of the province of Leinster at their back by Brian's quarrel with Gormfhlaith, who was sister to the King of Leinster, seem, probably for the first time, to have seriously contemplated the complete conquest of Ireland.