Flavius of Rouen

Flavius of Rouen, also called Filleul, is a Catholic and Orthodox saint, bishop of Rouen in the sixth century. He seems to have been of Roman origin or from a Gallic family that knew Rome. According to Dadré's chronicle he was governor of the palace of King Dagobert, but this does not fit the chronology. He may have been treasurer or steward of the finances of Clothar or Childebert; the former is the more likely.

Having become bishop of Rouen, he took part in the councils of Orléans of 533, 538 and 541. It was also during his episcopate, and according to some at his urging, that the abbey of Saints Peter and Paul, the future abbey of Saint-⁠Ouen, was founded in 535. The number of sixth-⁠century objects found in the nineteenth-⁠century excavations seems to confirm the tradition. According to legend, he turned the fountain of a pagan temple into a baptistery.

According to an old chronicle of Jumièges, his body was buried in the basilica of Saint Peter. A fountain stood in Rouen in the Rue du Baptême, in the Cauchoise suburb. He is remembered on 23 August.