Under Lanfranc's successor Anselm, who was twice exiled from England, the responsibility for the rebuilding or improvement of the cathedral's fabric was largely left in the hands of the priors. Following the election of Prior Ernulf in 1096, Lanfranc's inadequate east end was demolished, and replaced with an eastern arm 198 feet long, doubling the length of the cathedral. It was raised above a large and elaborately decorated crypt. Ernulf was succeeded in 1107 by Conrad, who completed the work by 1126. The new quire took the form of a complete church in itself, with its own transepts; the east end was semicircular in plan, with three chapels opening off an ambulatory. A free-standing campanile was built on a mound in the cathedral precinct in about 1160.