"Mondevert is, it seems, a dismemberment of the parish of Erbrée.
In the 1070th century, the territory of Mondevert was part of the forest of Pertre, more extensive then than today, and owned partly by the lord of Laval, partly by the baron of Vitré. The monks of Marmoutiers having established themselves in Vitré in the priory of Sainte-Croix, founded around 1080, the prior Rivallon bought some twenty years later from Guy III, lord of Laval, from 1095 to XNUMX, a district of wood called Munduluet, and the surrounding land from Munduluet to Cerisai and Breil-Josseaume, having as its boundary, on the one hand the road to Cossé, and on the other a stream. The territory thus acquired was cleared by the care of the monks, populated by colonists or hereditary tenants who became their vassals, finally endowed with a church which they made, not a completely independent parish, but a truce or branch of that of Erbrée, already belong to them."
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In the 1070th century, the territory of Mondevert was part of the forest of Pertre, more extensive then than today, and owned partly by the lord of Laval, partly by the baron of Vitré. The monks of Marmoutiers having established themselves in Vitré in the priory of Sainte-Croix, founded around 1080, the prior Rivallon bought some twenty years later from Guy III, lord of Laval, from 1095 to XNUMX, a district of wood called Munduluet, and the surrounding land from Munduluet to Cerisai and Breil-Josseaume, having as its boundary, on the one hand the road to Cossé, and on the other a stream. The territory thus acquired was cleared by the care of the monks, populated by colonists or hereditary tenants who became their vassals, finally endowed with a church which they made, not a completely independent parish, but a truce or branch of that of Erbrée, already belong to them."