Robert of Arbrissel (c. 1045 – 1116) was an itinerant preacher, and founder of the abbey of Fontevrault. He was born at Arbrissel (near Retiers, Brittany); and died at Orsan.
The first Vita was written by Baudri of Dol, abbot of the monastery of Saint-Pierre of Bourgueil, shortly after Robert's death in 1116. A second Life was commissioned a few years later by Petronilla, Abbess of Fontevrault, probably to support her authority as abbess.
Robert was born around 1045 at Arbrissel in Brittany, the son of Domalioch and Orguende. His father was a parish priest. Married clergy were not uncommon prior to the Gregorian reform. He probably succeeded his father as priest to the parish. Seeking to improve his education, he went to Paris were he spent some years in study, perhaps under Anselm of Laon and later displayed considerable theological knowledge. The date and place of his ordination are unknown. Sometime prior to 1076, Robert returned to his parish. In 1078, Bishop Sylvester de La Guerche, was deposed by a legate of Gregory VII, and as Robert had supported Sylvester's election, Robert was compelled to leave the diocese.
Robert resumed his studies in Paris until recalled by the now reinstated Bishop Sylvester. He then served as Sylvester's archpriest, effectively running the diocese of Rennes. Bishop Sylvester attempted, with Robert's assistance, to introduce reforms, which provoked antagonism on the part of the Breton clergy. Upon the death of Sylvester around 1093, Robert fled to Angers and there commenced ascetic practices which he continued throughout his life.
In 1095 he became a hermit in the forest of Craon (south-west of Laval), living a life of severe penance in the company of Bernard of Thiron, afterwards founder of the Congregation of Tiron, Vitalis, founder of Savigny Abbey, and others of considerable note. His piety, eloquence, and asceticism attracted many followers, for whom in 1096 he founded the monastery of La Roé of Canons Regular, becoming himself the first abbot. In the same year Urban II summoned him to Angers and appointed him an apostolic missionary authorized to preach anywhere.