 The nave high vaults were erected in the 1220s, the canons moved into their new stalls in 1221 under a temporary roof at the level of the clerestory, and the transept roses were erected over the next two decades.The high vaults over the choir were not built until the last years of the 1250s, as was rediscovered in the first decade of the 21st century.From 1997 until 2018, the exterior of the cathedral underwent an extensive cleaning, that also included many of the interior walls and the sculpture.