What is "vellavi"

The Vellavi were a Gaulish people in the region of Le Puy-en-Velay in the region of the Auvergne, which, at the time of Julius Caesar's campaigns against the Gaul ( Gallic Wars) lay on the border of Gallia Narbonensis. The oppidum of Ruessium, an early seat of a Catholic bishop, began to be called during the 4th century the [civitas] que dicitur Vetula in pago Vellavorum— the city "called Vetula in the country ('pays') of the Vellavi" a document of 1004 termed it (Lauranson-Rosaz). Vellavi is retained in the modern toponym Le Velay.