ADO: Archbishop of Vienne 860-875; b. near Sens about 800; d. at Vienne Dec. 16, 875. He was considered one of the principal upholders of the papal hierarchy, and wrote a Martyrologium (best ed. by D. Giorgi, 2 vols., Rome, 1745), which surpasses all its predecessors in richness of material, and a Chronicon de sex aetatibus mundi (Paris, 1512; Rome, 1745 et al.; extracts in MGH, Script., ii., 1829, pp. 315-323) from the creation of the world to 874. His works are in MIPL, cxxiii. 1-452.