Norman chronicler whose records are an important source both for Anglo-French history and the intellectual renaissance in the 12th century.

Robert was born to a family apparently of high rank. In 1128 he joined the monastery at Bec, where he was ordained deacon (1131) and elected prior (1149). He became abbot of Mont-Saint-Michel in 1154. Robert occupied an excellent position for a 12th-century historian because Mont-Saint-Michel was one of the great European trading and cultural centres of the period. He had wide personal contacts and made two visits to England—in 1157 and 1175—which greatly enhanced his Appendix to Sigebert (a continuation of the chronicle of Sigebert de Gembloux, which had ended in 1112), covering England (and France) under Henry II from 1154 to 1186.

Although Robert's chronology is somewhat dubious because the task of copying was left to his successors, his account of Henry's experiences in continental Europe is extremely valuable, and his use of such other sources as Fulbert of Chartres, Eadmer, and Bede is reliable. The chronicle was highly respected by contemporaries for its literary style and erudition, and it remains an important document today. Robert also wrote a treatise on monastic orders and Norman abbeys (1154), was responsible for the annals of Mont-Saint-Michel from 1135 to 1173, and prepared prefaces for a collection of excerpts from St. Augustine and for Pliny's Natural History.