Ado or Adon of Vienne (Latin: Ado or Adonis Viennensis; d. 16 December 874), was archbishop of Vienne in Lotharingia from 850 until his death. He belonged to a prominent Frankish family and spent much his early adulthood in Italy. Several of his letters are extant and reveal their writer as an energetic man of wide sympathies and considerable influence. Ado's principal works are a Martyrologium, and a chronicle, Chronicon sive Breviarium chronicorum de sex mundi aetatibus de Adamo usque ad annum 869.
Ado's chronicle is based on that of Bede, with which he combines extracts from the ordinary sources, forming the whole into a consecutive narrative founded on the conception of the unity of the Roman Empire, which he traces in the succession of the emperors, Charlemagne and his heirs following immediately after Constantine VI and Irene. "It is," says Wattenbach, "history from the point of view of authority and preconceived opinion, which exclude any independent judgment of events."
Ado wrote also a book on the miracles (Miracula) of St. Bernard, archbishop of Vienne (9th century), published in the Bollandist Acta Sanctorum; a life or Martyrium of St. Desiderius, bishop of Vienne (d. 608); and a life of St. Theudericus, abbot of Vienne (563).
- printed inter al. in Migne, Patrologia latina. cxxiii, pp. 181-420; append, pp. 419-436
- In Migne, cxxiii, pp. 20-138, and Pertz, Monumenta Germaniae Historica ii, pp. 315-323 (excerpts).
- Written about 870 and published in Migne, cxxiii, pp. 435-442.
- Published in Mabillon, Acta Sanct. i, pp. 678-681, Migne, cxxiii, pp. 443-450, and revised in the Bollandist Acta Sanctorum, 29 October, xii, pp. 840-843.
- This article incorporates text from a publication now in the public domain: Chisholm, Hugh, ed. (1911). "Ado". Encyclopædia Britannica 1 (11th ed.). Cambridge University Press.
- Wattenbach, W. Deutschlands Geschichtsquellen, Vol. I. (Stuttgart and Berlin, 1904).