Adémar de Chabannes.
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. Life and career
Besides perhaps Guillaume de Machaut, more is known about the life of Adémar than any other medieval composer. Part of this was from the well-recorded notoriety he would achieve from various infamous events, but also because the Abbey in which he worked preserved a huge amount of his literary and musical manuscripts. Unlike other documents there, the Adémar collection was later purchased by Louis XV, and thus spared from the substantial destruction of documents there during the French Revolution.
Adémar was born at Chabannes, a village in today's Haute-Vienne département of France. Educated at the Abbey Saint-Martial de Limoges, he passed his life as a monk both there and at the monastery of Saint-Cybard at Angoulême. Adémar died around 1034, most probably at Jerusalem, where he had gone on a pilgrimage. Works Adémar as chronicler Adémar's life was mainly spent in writing and transcribing chant books and chronicles, and his principal work is a history entitled Chronicon Aquitanicum et Francicum or Historia Francorum. This is in three books and deals with Frankish history from the reign of Pharamond, king of the Franks, to 1028. The first two books are scarcely more than a copy of earlier histories of Frankish kings, such as the Liber Historiae Francorum, the Continuation of Fredegar and the Annales regni Francorum. The third book, which deals with the period from 814 to 1028, is of considerable historical importance. It relies partly on the Chronicon Aquitanicum, to which Adémar himself added a final notice for the year 1028.