Romainmôtier Priory is a former Cluniac priory in the municipality of Romainmôtier-Envy in the canton of Vaud in Switzerland. The monastery was founded by Romanus of Condat, after whom it was named. It is entered on the Swiss inventory of cultural property of national and regional significance.
The first monastery at Romainmôtier was built around 450 by Romanus of Condat. Romanus was born about 400 and died in 463 or 464. When he was thirty-five years old he went into the lonely region of Condat to live as a hermit, where after a while his younger brother Lupicinus followed him. A large number of scholars, among whom was Saint Eugendus, placed themselves under the direction of the two holy brothers who founded several monasteries including Romainmôtier (Romanum monasterium) in the canton of Vaud in Switzerland. Romanus was ordained a priest by Saint Hilary of Arles in 444, and with Lupicinus he directed these monasteries until his death. Two lives of him are in existence: one by Gregory of Tours in the "Liber vitae patrum", and an anonymous "Vita Sanctorum Romani, Lupicini, Eugendi". It is Gregory of Tours that gives the date of 450. Only a rhymed chronicle from the 13th century and the writings of Commissioner Aymonnet Pollen (1519) describe the founding of Romainmôtier Priory. Excavations carried out in 1905-15 discovered traces of a church dating from the 5th century, which confirmed this early date. In the 6th century, there is a record of an abbot Florianus who was abbas ex monasterio de Romeno, which is probably a reference to Romainmôtier.
The early monastery fell into disrepair and was rebuilt by Duke Chramnelenus. This rebuilt monastery was placed under the monastic rule of Saint Columbanus by 642. In 649 Saint Wandregisel, the future abbot of Fontenelle Abbey, visited Romainmôtier and found a thriving and diverse monastic life. The 5th-century church was enlarged and in the 7th century a second church was built with a rectangular choir. The second church was built on the south side of the first. Pope Stephen II visited the monastery in 753 while traveling for a meeting with Pepin the Short and according to tradition consecrated the churches of Saints Peter and Paul.