Merquel Priory was founded by the monks of Saint-Gildas-de-Rhuys in the seventh century.
The oldest text which mentions Mesquer for the first time in 1182 is an inventory of property of the Templars which indicates the water mills in Mesquer. The first inhabitants of Mesquer built their first parish, the chapel of Saint-Mars, near the convent. There was once a cemetary used by monks and Mesqui between the Benedictine church and parish building.
HERITAGE:
- Notre Dame (1892), the work of René Menard. This church replaced a Romanesque building destroyed in 1892-1900. The 12th century low-built building could once be seen from far away thanks to its high square tower, fixed on the transept window. The stalls date from the nineteenth century;
- Quimiac chapel. The statue of Notre-Dame de la Plage, in polychrome wood, work of sculptor Jean Fréour, dated 1956 ;
- Calvary situated at Kerlagadec
- Heritage house (15th century).Former convent which later became Mesquer's coaching inn.
- Bread oven (17th century), situated at the château de Tréambert. The château de Tréambert, fief of the Sesmaisons family, is a lordship until 1690. It then became a marquisate belonging to the Becdelièvre family. Today it is a holiday centre. The Sesmaisons family is one of the oldest families in the Nantes region (Jean I of Sesmaisons followed, with his brother Hervé, Pierre Mauclerc the Crusade) ;
- the presbytery (17th century) ;
- several fountains including those of Merquel, Jabot, de Fontainegué, de Saint Gobrien ;
- 5 mills including those of Beaulieu (1739), Barry, Kerguilleau, de la Lande, the town of Mesquer (before 16th century). The latter was formerly the property of the Marquis of Becdelièvre, lord of Tréambert
