Saxon abbey was incorporated in the later forms. Norman abbey Much of the current layout and proportions of the structure date from the first Norman abbot, Paul of Caen (1077–1093). The 14th abbot, he was appointed by his uncle, the new Archbishop of Canterbury, Lanfranc. Building work started in the year of Abbot Paul's arrival. The design and construction was overseen by the Norman Robert the Mason. The plan has very limited Anglo-Saxon elements and is clearly influenced by the French work at Cluny, Bernay and Caen, and shares a similar floor plan to Saint-Étienne in Caen and Lanfranc's Canterbury—although the poorer quality building material was a new challenge for Robert and he clearly borrowed some Roman techniques, which were learned while gathering material in the ruins of Verulamium. To take maximum use of the hilltop the Abbey was oriented to the south-east. The cruciform abbey was the largest built in England at that time, it had a chancel of four bays, a transept containing seven apses, and a nave of ten bays—fifteen bays long overall. Robert gave particular attention to solid foundations, running a continuous wall of layered bricks, flints and mortar below and pushing the foundations down to twelve feet to hit bedrock. Below the crossing tower special large stones were used. The tower was a particular triumph—it is the only 11th-century great crossing tower still standing in England. Robert began with special thick supporting walls and four massive brick piers. The four-level tower tapers at each stage with clasping buttresses on the three lower levels and circular buttresses on the fourth stage. The entire structure masses 5,000 tons and is 144 feet high. The tower was probably topped with a Norman pyramidal roof; the current roof is flat. The original ringing chamber had five bells—two paid for by the Abbot, two by a wealthy townsman, and one donated by the rector of Hoddesdon. None of these bells has survived. There was a widespread belief that the Abbey had two additional, smaller towers at the west end. No remains have been found. The monastic abbey was completed in 1089 but not consecrated until Holy Innocents' Day (28 December), 1115, by the Archbishop of Rouen. King Henry I attended as did many bishops and nobles. A nunnery (Sopwell Priory) was founded nearby in 1140. Internally the Abbey church was bare of sculpture, almost stark. The plaster walls were coloured