Adémar de Chabannes

Adémar de Chabannes (988/989 – 1034; also Adhémar de Chabannes) was a French/Frankish monk, active as a composer, scribe, historian, poet, grammarian and literary forger. He was associated with the Abbey of Saint Martial, Limoges, where he was a central figure in the Saint Martial school, an important center of medieval music. Much of his career was spent copying and transcribing earlier accounts of Frankish history; his major work was the Chronicon Aquitanicum et Francicum (Chronicle of Aquitaine and France).

He is well known for forging a Vita, purportedly by Aurelian of Limoges, that indicated Saint Martial was one of the original apostles, and for composing an associated Mass for Saint Martial. Though he successfully convinced the local bishop and abbot of its authenticity, the traveling monk Benedict of Chiusa exposed his forgery and damaged Adémar's reputation.

Read more about this composer on Wikipedia.