The Life of Saint Calmin is more a literary document than an historical record, in order to embellish the past of the founder of the Abbey of Mozac.

Calminius is initially a man of war, but he resolves to live in the austerity of religious life.

He began by going to the Velay mountains to the place called Le Villars, where he founded an oratory, Saint-Chaffre du Monastier.

Long before his death, he settled in Mozac, a place conducive to meditation since it is calm and abounds in water.

Before the construction of Mozac Abbey, Calminius went to Rome to obtain the consecration of the first monastery, Carmery en Velay.

He is buried in the crypt the day after the octave of the Ascension, but the year of his death remains unknown.

During the Middle Ages, there was a country chapel named of Saint-Calmin, on the road between Riom and Mozac.

The only indirect vestige of the Saint-Calmin church is a stone cross standing at the crossroads between the boundaries of Mozac and Riom.

It is decorated with Limoges champlevé enamel, depicting scenes from the life of the saint and his wife, in particular the foundation of the three institutions and his funeral.

It was hidden and saved in 1789 during the French Revolution by a villager and municipal councillor Jean Ozenne (1756–1832).