Tradition holds that he was a bishop of Helvia Ricina (Macerata), during the 3rd century, martyred on November 24.
[1] His cult is ancient and widespread in the Marche and Umbria, with many churches and abbeys dedicated to him, but historical information on his life is limited to a few details and traditions.
[1] Ricina was destroyed by the Goths during the 5th and 6th centuries, and its inhabitants emigrated to Recanati, thus spreading Flavian's cult.
[1] Other groups of refugees carried the relics of the saint in the direction of Tolentino, erecting an oratory in honor of Flavian, on a site that may have been associated with a pagan deity.
On the site of this oratory, the Benedictine Rambona Abbey still preserves Flavian's relics.