Mellonius was a 4th-century bishop of Rotomagus, known today as Rouen, in the Roman province of Lugdunensis. While he is recognized as a Catholic saint, his historical existence remains uncertain because his primary biography was written in the 17th century. According to legend, he was born near Cardiff and traveled to Rome, where he was converted to Christianity and ordained by Pope Stephen I. He eventually moved to Gaul to serve as a bishop, following the death of Nicasius.
Life and legend
According to tradition, Mellonius traveled to Rome to deliver British tribute, where he met Pope Stephen I. After the Pope's martyrdom, he moved to Gaul and became the Bishop of Rouen in 261. He held this position for many years before retiring to a hermitage in Héricourt, where he died in 314. Some historical accounts confuse him with other figures, such as the Bishop of Troyes or Saint Melaine.
Veneration and legacy
His feast day is celebrated on 22 October. Though his remains were originally buried in Rouen, they were moved to Pontoise in the 8th century to protect them from Norse raids, before being lost during the French Revolution. He is honored through several churches, including St. Mellon's Church in Cardiff and a site in Thiédeville, where a holy well was once located.