On a river at the southern edge of the Massif Central, Le Vigan is situated on a natural boundaryline. In the 2nd-3rd centuries BCE, it was situated between the territories occupied by the Volcae Arecomici, the Averni, and the Gabali tribes. In 121 BCE the Romans gained control of much of southern France including the area around Le Vigan. The Volcae Arecomici voluntarily surrendered their territory, and the Arverni gave up much territory in a treaty that nevertheless preserve their independence. Under Roman control, Le Vigan was part of the Roman Provincia, (hence Provence) called Gallia Narbonensis. The Visigoths took control of the western half of Gallia Narbonensis in 462 CE, a part known as Septimania which included Le Vigan, and they retained control despite attempts in 586 and 589 by the Frankish (Merovingian) King Guntram to conquer the area from the north. In 587 the region came under Catholic rule with the conversion of the Visigoth king Reccared I. In 719, the Moor Al-Samh conquered Septimania and the Franks struggled to take it back over the next several decades. By 780, Charlemagne had conquered the entire territory.