 It is in the Gothic and Romanesque architectural traditions.The site, between Apt and Sisteron on the Roman road Via Domitia, was once that of the Roman settlement of Alaunium, named after the local god Alaunius, which later became Aulun, and gave its name to the chapel that was built there, Sainte-Marie d'Aulun.There is an ancient tradition to the effect that on the occasion of a cure wrought before here in 1665 on 2 August, (the Feast of Our Lady of the Angels), a choir of angels, it is said, was heard singing.