Located at an altitude of 406 metres, Ailhon is a commune in the canton of Aubenas-2 and the arrondissement of Largentière, some 5 km south-west of Aubenas.

There is also the Auzon which rises just north of the commune and forms the eastern border gathering many tributaries and continues south to join the Ardeche near Saint-Sernin.

In 1670, Ailhon participated in the Roure Revolt, a rebellion caused by a disastrous harvest followed by a rumour of an increase in taxes.

His body was then exposed on the high road from Montpellier to Nimes and his head placed on top of the Porte Saint-Antoine in Aubenas.

[4] The disorder during the French Revolution resulted in a band of brigands led by Fourniquet de Chassiers (executed at Saint-Cirgues-de-Prades in May 1800) scouring the territory.