The mutual influence of the Danish raids upon the policy of the Empire of the Franks, and vice versa, was a natural consequence, although one not sufficiently appreciated. Thus the internecine struggle of the three sons of Louis the Pious, which we have described in an earlier paper, and which culminated in the battle of Fontenay, was immediately followed by Osker's attack on the Seine, and by the capture of Nantes by the pirates. These terrible disasters drew the brothers together for a while, and on the earnest pressure of the grandees of the various parts of the empire a solemn assembly was convened. ‘At Coblentz,’ says Palgrave, ‘the three envious brothers, the three grudging and hostile kings, were convened in stately congress, their nobles, their prelates, and 110 delegates or commissioners, a special parliament. They held their sessions in that edifice still appearing as the principal feature in the sunny and cheerful city, the twin-towered church of St. Castor. A long discussion took place between the envoys on either side, and eventually special commissioners were appointed to ascertain the value and revenues of the various bishoprics, abbeys, counties, and royal domains; and it was agreed that the congress should be adjourned over the winter and meet the following year at Verdun.’ They accordingly met at Verdun, July 15, 843, and the three brothers having come together and undertaken to ratify the decision of their envoys, the treaty was duly signed in August 843, and is known as the Treaty of Verdun.