Roscellinus was born in
Compiègne,
France. Little is known of his life, and knowledge of his doctrines is mainly derived from
Anselm and
Abelard. He studied at
Soissons and
Reims, was afterwards attached to the
cathedral of Chartres and became canon of
Compiègne. As a monk of Compiègne, he was teaching as early as 1087. He had contact with
Lanfranc, Anselm, and
St. Ivo of Chartres. Roscellinus's exposition of
Nominalist doctrines, and especially his application to the
dogma of the
Trinity, attracted broad attention. He maintained that the three persons of the Trinity were not referred to as three substances or Gods only by convention, arguing that if they were really one substance then
God the Father and the
Holy Spirit would have become incarnate along with
God the Son. Roscellinus cited Lanfranc and Anselm in support of this doctrine. In 1092/1093, however, a
council convoked at Soissons by the
archbishop of Reims condemned his interpretation and accused Roscellinus of
tritheism. Roscellinus, out of fear of
excommunication and even
stoning to death by the orthodox populace, recanted his beliefs, but later returned to professing them. Roscellinus left for England, but having made himself unpopular by an attack on the doctrines of Anselm, he left the country and repaired to Rome, where he was well received and became reconciled to the Catholic Church. He then returned to France, taught at
Tours and
Loc-menach (where he had Abelard as a pupil), and finally became canon of
Besançon. He is heard of as late as 1121, when he came forward to oppose Abelard's views on the Trinity. He was also sent a letter by
Theobald of Étampes in response to his criticisms of the sons of priests. Of his writings there exists only a letter addressed to Abelard on the Trinity, in which Roscellinus "belittles Abélard and makes merry over his
castration."
Hauréau brings forward his name in connection with a text, "Sententia de universalibus secundum magistrum R.", but this is a conjecture. His doctrines are attested by Anselm, Abelard,
John of Salisbury, and an anonymous epigram. ==Nominalism==