Mellonius of Rouen

Holy Hierarch Mellonius of Rouen, also called Melon, is said to have been bishop of Rouen (Rotomagus) in Gaul at the beginning of the 4th century; tradition has him reposing in 314. He is known only from a 17th-⁠century Life of little historical value, so his very existence is uncertain. He is a saint of the undivided Church, known from the Western calendars.

The Life says he was born near Cardiff in Wales and went to Rome with the British tribute, where Pope Stephen I converted him, ordained him priest and then bishop. After Pope Stephen's martyrdom in 257 he is said to have gone to Gaul and in 261 to have succeeded Saint Nicasius in the see of Rouen. After a long episcopate, in 311, he retired to a hermit's cell at Hericourt, where he reposed. Avitianus succeeded him. Accounts of him are often confused with those of Saint Melaine, bishop of Rennes.

He is commemorated on 22 October, the liturgical date in the Orthodox calendar (the same day number on the old and new calendars).