Bishop of Tomi, Romania, on the Black Sea. He was exiled by Emperor Valens for opposing the Arian heresy. The people of Tomi, however, forced the emperor to restore him to his see.
Saint Bretannio (also Bretanion, Bretannion, Vetranio, Vetranion) was a bishop of Tomi (today Constanţa, Romania) during the fourth century. Of Cappadocian origin, he occupied the see of Tomi from 360.[1]
According to Sozomen, during the campaign against the Goths in this region, the emperor Valens stopped at Tomi and urged the populace to convert to Arianism and reject the Nicene Creed. Bretannio spoke out against this and for this he was exiled.[2] However, due to public outcry over the bishop’s exile, he was allowed to return.[3]
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