Thetford Priory is a Cluniac monastic house in Thetford, Norfolk, England. Founded in 1103 by Roger Bigod of Norfolk, Thetford was one of the most important monasteries of East Anglia. It should not be confused with the Dominican Friary of Blackfriars, Thetford that later became part of Thetford Grammar School. History One of the most important East Anglian monasteries, Thetford Priory was founded in 1103 by Roger Bigod of Norfolk, in lieu of a vow of pilgrimage to the Holy Land. The abandoned cathedral church of the East Anglian bishops, on the Suffolk side of the River Little Ouse, was at first selected as the church of the new priory, dedicated to the Blessed Virgin. A cloister or cells of woodwork were erected for the accommodation of the monks, and Benedictines from the Priory of St Pancras in Lewes arrived in 1104. Three years later, a new prior realized that the monastic site, surrounded by the houses of the burghers, was inconveniently overcrowded, with no room for a guest-house. Bigod then gave them a pleasant and open site on the other side of the river in the county of Norfolk. The monks relocated to their new premises on St. Martin's Day, 1114. In the 13th century, the Virgin Mary is said to have appeared in a vision to locals requesting the addition to the site of a Lady Chapel. During its construction, an old statue of her from their former site was discovered to have a hollow in its head concealing saints' relics, and became a magnet for pilgrims. In a 1390 visitation, visitors from Cluni found that there were then twenty-two monks; six daily masses, three of which were sung; and that tenth part of the bread was reserved for distribution to the poor. The visitors found that all monastic obligations according to the Cluni rule were duly observed. During the time of the Dissolution of the Monasteries, a formal complaint was raised by the Mayors and burgesses of Thetford to Thomas Cromwell in 1539, arguing that many of the town's inhabitants would fall into extreme poverty because their livelihoods depended on pilgrims visiting the priory. Henry VIII rejected a plan proposed by Thomas Howard, 3rd Duke of Norfolk to convert the priory into a collegiate church. The dean was to be Prior William, and the six prebendaries and eight secular canons were to be the monks of the