 Supported by the evidence of the names of the "tenements" of La Moinerie and La Moinerie de Haut, it is believed that the Seigneurie was constructed on the site of the monastery of Saint Magloire.Magloire had been Samson of Dol's successor as bishop of Dol, but retired and founded a monastery in Sark where he died in the late sixth century.According to the "vita" of Magloire, the monastery housed 62 monks and a school for the instruction of the sons of noble families from the Cotentin.