Guerard, Robert a learned French Benedictine, was born at Rouen in 1641. He assisted Delfau in the revisal of St. Augustine's works; while thus employed, was accused of being concerned in a satirical book entitled, L'Abbe Commendataire, and confined in the abbey of Aimbournay, in Bugey. He took advantage of this exile to make a diligent search for ancient MSS., and discovered a great number; among others, St. Augustine's book against Julian, entitled, Opus Impefectum. He was afterwards sent to Foscamp, then to Rouen, where he died, January 2, 1715. He left Abrge de la Bible (first published in 1707). See Hoefer, Nouv. Biog. Generale, s.v.