About Mellonius
Lived 229 – 314 (aged 84–85). Mellonius was a catholic priest.
Legend Mellonius (surnamed Probus) who ordained him priest and later consecrated him a bishop.
Shortly after the martyrdom of Pope Stephen in 257, Mellonius set out for Gaul. He succeeded Nicasius of Rouen as Bishop of Rouen in 261. After a long episcopate, in 311, he retired to a hermit's cell at a place called Hericourt, where he died A.D. 314. Mellonius was succeeded by Avitianus.
He is sometimes confused with Mellonius, Bishop of Troyes, from 390 to 400.
Veneration His feast day is 22 October. In the English translation of the 1956 edition of the Roman Martyrology, 'St Mellon' is listed under 22 October with the citation: At Rouen, St Mellon, Bishop, who was ordained by Pope St Stephen and sent thither to preach the Gospel.
In the 2004 edition of the Roman Martyrology, Mellonius is listed under the same date, 22 October, with the Latin name Mallóni. He is mentioned as follows: 'At Rothómagi (Rouen), bishop, who in that city announced the Christian faith and handed on the episcopate'.
Bishop Mellonius is depicted in a fifteenth-century illuminated Book of Hours.
Mellonius was buried at Rouen, but his remains were subsequently translated to a church in Pontoise towards the end of the eighth century to protect them from Norse warbands. They remained there until they were lost during the French Revolution.
Legacy
St. Mellon's Church in St. Mellons, Cardiff is dedicated to Mellonius of Rouen. A fair used to be held on his feast day in the village of St Mellons. The church was previously dedicated to St. Lucius, but was changed upon the arrival of the Normans. The church at Thiédeville is dedicated to him at Héricourt, where there was a holy well. There is also a church dedicated to St. Mellon in Plomelin, Brittany.
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Important facts
People in Mellonius's life
Named in this biography and alive at the same time
Contemporaries
People whose lives overlapped Mellonius's
Frequently asked questions
Who was Mellonius?
Bishop of Rotomagus
When was Mellonius born?
Mellonius was born in 229 in Cardiff.
When did Mellonius die?
Mellonius died in 314 in Héricourt-en-Caux.
What was Mellonius's occupation?
Mellonius was a catholic priest.
Sources & further reading
Cite this page
APA: Biography.guide. (2026). Mellonius. https://biography.guide/mellonius/
MLA: "Mellonius." Biography.guide, https://biography.guide/mellonius/.
Chicago: "Mellonius." Biography.guide. https://biography.guide/mellonius/.
Data last updated: 2026-09-22 · Spot an error? Report a correction.
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