As Treasurer of the King's Jewels, Williams was heavily involved in the Dissolution of the Monasteries, during which he obtained Thame Abbey and its lands.
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In 1280 he offered the general chapter of the Cistercian order to found a college (studium) for Cistercians at Oxford, and the chapter accepted the offer, and decreed that the college should have the same privileges as the college of St. Bernard at Paris, and that it should be under the Abbot of Thame, as the other was under the Abbot of Clairvaux.