He was born at
Loudun, of a noble family. When only eight years old, he was confided to the care of his great-uncle,
Charles Montault des Isles,
Bishop of Angers. He studied theology at the
Seminary of St. Sulpice, and went to Rome to continue his studies in theology and archaeology at the
Sapienza and the
Roman College. After four years his health obliged him to return to France (1857), where he was appointed historiographer of the Diocese of Angers. He searched the archives of the diocese, studied its inscriptions and monuments, and founded a diocesan museum, a project in which
Arcisse de Caumont took a lively interest. Another sojourn of fourteen years in Rome (1861–75) enabled him to augment his knowledge of liturgy and Christian antiquities. He was
canonical consultor to different French bishops, and at the
First Vatican Council acted as theologian to
Mgr Desflèches. He died, aged 71, at
Blaslay, Vienne, France. ==Works==