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“Following a fire, Abbot Bernier (1008-28) undertook the reconstruction of the abbey church, this work continuing during the 11th century and early years of the 12th century. The nave was vaulted under the abbacy of Pierre I (1066-1107) and the dome was erected between 1107 and 1120. The pronaos, for which Bernier was responsible, underwent an important change in plan while being built. The adoption of stout bonded pillars as supports for the transverse barrel vaults is repeated in the nave, but on a much less grandiose scale.”

— John Julius Norwich. The World Atlas of Architecture. p196.