The text of the treaty which resulted has not come down to us in documentary form, but it is possible to reconstruct its terms with some fulness from the narrative sources. Robert gave up all claim to the English crown, released Henry from the homage which he had done him on an earlier occasion—probably upon the receipt of the Cotentin in 1088—and recognized his royal title and dignity.[67] It was not considered fitting that an English king should remain the vassal of a Norman duke. On his side, the king undertook to pay Robert an annual subsidy of 3000 marks of silver[68] and to surrender all his holdings in Normandy except the great stronghold of Domfront.[69] Long years before, when Henry had been a wandering exile, his fortunes at their lowest, the men of Domfront had voluntarily called him in and made him their lord; and on taking possession of their town and castle he had solemnly sworn never to abandon them. The binding force of this oath was now invoked as a pretext for the king’s retention of a solitary outpost in Robert’s dominions. An amnesty provision was added for the benefit of the barons with holdings on both sides of the Channel who by supporting one of the brothers had jeopardized their interests with the other. Robert undertook to restore all Norman honors which he had taken from the king’s supporters;[70] and Henry promised the restoration of all English lands which he had seized from partisans of the duke.[71] A special clause, of which we would gladly know the full significance, provided that Count Eustace of Boulogne should have “his paternal lands in England.”[72] Further, it was agreed that, if either of the brothers should die before the other and leave no lawful heir, the survivor should succeed to his dominions whether in England or in Normandy.[73]
So far the provisions of the treaty seem reasonably certain. The remainder are more doubtful. Ordericus Vitalis asserts—and his whole defence of Henry’s dealings with Robert down to the latter’s overthrow at Tinchebray, and after, is founded upon the assertion—that Robert and Henry entered into a sworn agreement to recover all of the Conqueror’s domains which had been lost since his death and to visit condign punishment upon the wicked men who had fomented discord between them.[74] Wace adds that each undertook, in case the other should be at war, to furnish him with one hundred knights so long as the war lasted.[75] According to the Annals of Winchester, Ranulf Flambard gave up his bishopric of Durham.[76]