archbishop, Lanfranc (1070–1077). He cleared the ruins and reconstructed the cathedral to a design based closely on that of the Abbey of Saint-Étienne in Caen, where he had previously been abbot, using stone brought from France. The new church, its central axis about 5 m south of that of its predecessor, was a cruciform building, with an aisled nave of nine bays, a pair of towers at the west end, aisleless transepts with apsidal chapels, a low crossing tower, and a short quire ending in three apses. It was dedicated in 1077. 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. As with many Gothic church buildings, the interior of the quire was richly embellished. William of Malmesbury wrote: "Nothing like it could be seen in England either for the light of its glass windows, the gleaming of its marble pavements, or the many-coloured paintings which led the eyes to the paneled ceiling above." Though named after the 6th-century founding archbishop, the Chair of St Augustine, the ceremonial enthronement chair of the Archbishop of Canterbury, may date from the Norman period. Its first recorded use is in 1205. Plantagenet period Martyrdom of Thomas Becket A pivotal moment in the history of the cathedral was the murder of the archbishop, Thomas Becket, in the north-west transept (also known as the Martyrdom) on Tuesday 29 December 1170, by knights of King Henry II. The king had frequent conflicts with the strong-willed Becket and is said to have exclaimed in frustration, "Will no one rid me of this turbulent priest?" Four knights took it literally and murdered Becket in his own cathedral. After the Anglo-Saxon Ælfheah, Becket was the second Archbishop of Canterbury to be