 A first church was built to house the remains of Florus, a bishop of dubious historicity and first legendary apostle of Upper Auvergne.This building is attested by a papal bull of Pope Gregory V at the end of the 10th century.In the 11th century, Odilon de Mercœur, Abbot of Cluny built a Romanesque basilica that Pope Urban II consecrated in 1095 under the triple name of Saint-Sauveur, Saint-Pierre and Saint-Flour.