The town takes its name from a hill (from the Breton "number" or "bran") dedicated to the great Welsh St. Dewi (David).
The town of Brandivy overlooks the beautiful valley of Loc'h. It is inhabited since prehistoric times, as evidenced by many objects found during excavations.
During the Middle Ages, the Loc'h is dominated by several feudal mounds. The ruins of the castle built in the year by the Baron de Mille Lanvaux, one of the oldest baronies of Britain, remaining close to the lake of the woods.
Until the Revolution, Brandivy depends County Largoët the Seneschal d'Auray. She was made a separate parish following the Concordat of 1802, and independent joint June 4, 1862.
