Comment I do not think it is a plaster which remains exposed in the open air. When I took the photo this relief was visible on the left of this file , it would be the remains of the cloister the 14th used as a cemetery, it was called the arches because it contained sepulchral arches of families of the nobility of the city. This convent was decorated by artists whose personal details are not known but to whom scholars have attributed works recognized as belonging to one hand for the uniformity of characteristics and styles. --Pierre André (talk)09:57, 21 January 2021 (UTC)[reply]
