The college was a primary learning center of Sub-Roman Britain (now Wales), but was unfortunately situated in a location on the Glamorgan Plain that exposed it to hostile incursions from Irish pirates, and to Viking raids. The college is said to have been destroyed by the Danes in 987, and by the Normans in the late 11th century. After the Norman sack, many of the college's endowments were transferred to the Abbey of Tewkesbury by Robert Fitzhamon. Côr Tewdws was rebuilt in 1111, but probably on a reduced scale. It also lost its right of sanctuary for a time, before the right was restored by Nicholas, Bishop of Llandaff, in 1150. It was finally dissolved by Henry VIII during the Dissolution of the Monasteries.