The east gallery, on the chapter house side, was probably completed by 1341. The three south, west and north galleries were built as from 1396 by the stone mason Jean Maurin who undertook to build them in keeping with the existing east gallery. Jean Maurin in all likelihood followed in the footsteps of his uncle, Jacques Maurin, from whom he inherited most of his sites in 1380 and who is assumed to have been the author of the east gallery at the beginning of his career.