For upwards of two hundred years the De Wessyngtons had now sat in the councils of the palatinate; had mingled with horse and hound in the stately hunts of its prelates, and followed the banner of St. Cuthbert to the field; but Sir William, just mentioned, was the last of the family that rendered this feudal service. He was the last male of the line to which the inheritance of the manor, by the license granted to his father, was confined. It passed away from the De Wessyngtons, after his death, by the marriage of his only daughter and heir, Dionisia, with Sir William Temple of Studley. By the year 1400 it had become the property of the Blaykestons. [Footnote: Hutchinson's Durham, vol. ii., p. 489.] But though the name of De Wessyngton no longer figured on the chivalrous roll of the palatinate, it continued for a time to flourish in the cloisters. In the year 1416, John de Wessyngton was elected prior of the Benedictine convent, attached to the cathedral. The monks of this convent had been licensed by Pope Gregory VII. to perform the solemn duties of the cathedral in place of secular clergy, and William the Conqueror had ordained that the priors of Durham should enjoy all the liberties, dignities and honors of abbots; should hold their lands and churches in their own hands and free disposition, and have the abbot's seat on the left side of the choir--thus taking rank of every one but the bishop. [Footnote: Dugdale Monasticon Anglicanum. T. i., p. 231. London ed. 1846.] In the course of three centuries and upwards, which had since elapsed, these honors and privileges had been subject to repeated dispute and encroachment, and the prior had nearly been elbowed out of the abbot's chair by the archdeacon. John de Wessyngton was not a man to submit tamely to such infringements of his rights. He forthwith set himself up as the champion of his priory, and in a learned tract, _de Juribus et Possessionibus Ecclesiae Dunelm_, established the validity of the long controverted claims, and fixed himself firmly in the abbot's chair. His success in this controversy gained him much renown among his brethren of the cowl, and in 1426 he presided at the general chapter of the order of St. Benedict, held at Northampton. The stout prior of Durham had other disputes with the bishop and the secular clergy touching his ecclesiastical functions, in which he was equally victorious, and several tracts remain in manuscript in the dean and chapter's library; weapons hung up in the church armory as memorials of his polemical battles.