Hesychius I of Vienne

Hesychius I of Vienne (in French Isice or Hésychius, in Latin Isicius) was bishop of Vienne in the second half of the 5th century and died around 490. He is mentioned in the earliest catalogue of the bishops of Vienne, that of Ado (799-875). He had married Audentia and they had two sons: Avitus, his successor in the see, and Apollinaris, bishop of Valence. He seems to have been related to Sidonius Apollinaris. He belonged to a great Gallo-⁠Roman Burgundian family, the Hesychii, a branch of the Syagrii, from which several bishops came at Vienne and Grenoble. According to tradition he was a senator before he governed the Church of Vienne.

Ado mentions him as bishop at the time when Saint Severus of Vienne dedicated a church, at the death of Saint Germanus of Auxerre, but some historians place him later, probably between 475 and 490. The Hieronymian Martyrology has him on 16 March, and in the diocese of Grenoble-⁠Vienne he is commemorated on 1 July, together with Saint Martin and all the saintly bishops of Vienne. He is a saint of the undivided Church, venerated in the West.