Short answers, pulled from the story.
The Abbey of Saint-Aubin emerged as a monastic community by 616 when Bishop Bertrand du Mans implied its existence through historical records. A funerary basilica rose in Angers to house the tomb of Bishop Albinus who served from 529 until his death in 550.
The French Revolution eventually dispersed the monks who had lived there for centuries without specific dates beyond the general revolutionary period mentioned in historical accounts. No further details exist regarding specific dates of dispersal beyond the general revolutionary period mentioned in historical accounts.
The bell tower rose 54 meters above Angers during the 11th century standing apart from the main abbey complex. Medieval observers used this structure as a watchtower while it formed a small fortress complete with loopholes and an internal well.
Robert de La Tour-Landry initiated construction of the Romanesque cloister between 1127 and 1154 as abbot of Saint-Aubin. All that remains today is the eastern gallery containing the Chapter house door plus two series of arcades on either side.
Surviving cloister arcades located in the courtyard of the Angers prefecture received Historic Monument classification by decree on the 19th of July 1901. Additional protection came through inscription in a room on the first floor of the prefecture's central building.