Of monastic remains the most important are those of the great Benedictine abbey of Bury St Edmunds; the college of Clare, originally a cell to Bec Abbey in Normandy and afterwards to St Peters Westminster, converted into a college of secular canons in the reign of Henry VI, still retaining much of its ancient architecture, and now used as a boarding-school; the Decorated gateway of the Augustinian order priory of Butley; and the remains of the Grey Friars monastery at Dunwich.