Andeolus was a second-century subdeacon and missionary who traveled from Smyrna to evangelize southern Gaul. Accompanied by Benignus, he reportedly navigated through Corsica and Marseilles before moving inland along the Rhone and Saône rivers. During his mission, he is said to have converted Symphorianus, a noble who later became a martyr himself. His travels eventually led him to the Vivarais region, where his life ended during the reign of Septimius Severus.