Nectarius of Vienne

Saint Nectarius of Vienne was bishop of Vienne in Gaul in the fifth century, around 445 by the dating of our calendar. Wikipedia calls him a semi-⁠legendary bishop of whom very little is known.

Archbishop Ado, in the ninth century, places him under the emperor Constantius II (337 to 361) and says that he presided over the synod of Vaison and taught publicly in his church that the nature, power, divine essence and virtue of the Father, the Son and the Holy Spirit are one. Historians disagree over his presence at the synod of Vaison, around 350. The Orthodox calendar commemorates him on 5 May, and in the diocese of Grenoble-⁠Vienne his feast is kept on 1 July.