Prières Abbey

Prières Abbey (French: Abbaye de Prières or Notre-Dame de Prières; Latin: Abbatia de Precibus) is a former Cistercian monastery in the commune of Billiers in the department of Morbihan, Brittany, France, about 28 kilometres southeast of Vannes near the coast and the mouth of the River Vilaine.

The abbey was founded in 1251 and richly endowed by Duke John I of Brittany, as penance for his earlier destruction of the Priory of Saint-Pabu and annexation of its lands during the construction of the Château de Suscinio.

The site passed into private hands in 1801, after which most of the buildings were demolished.

Of the church, rebuilt in the early 18th century by the architect Olivier Delourme, there remain only the tower and part of the former transept converted into a chapel that contains the remains of the tombs of Duke John I (d. 1286) and of Isabella of Castile (d. 1328), the second wife of Duke John III of Brittany.

Also extant are the 18th-century guest lodgings, some service buildings and the precinct wall of 1699.