Martin was born about the year 527 at Nantes, in the heart of Merovingian Gaul. From youth he was marked by virtue, learning, and natural gifts that drew the notice of Saint Felix, Bishop of Nantes. Felix ordained him and soon named him archdeacon of the church of Nantes, charging him with the conversion of the city and the surrounding countryside, much of which—especially the region of the Herbauges south and southeast of the Loire—still clung to pagan customs.
After a pilgrimage to the tombs of the Apostles in Rome, Martin returned to his native land. About the year 577 he laid aside the public duties of the archdeaconate and withdrew into solitude on the right bank of the Sèvre Nantaise, a few miles from Nantes, in a desolate place that would become Vertou. There his hidden life of prayer and austerity attracted disciples. He built a church, enlarged his hermitage into a monastery, and became the first abbot of Vertou Abbey. He also founded other houses, among them the community at Durieu (Durinum), and is said to have introduced the Rule of Saint Benedict at Saint-Jouin-de-Marnes.
Tradition recounts that he planted his pilgrim's staff in the middle of the abbey courtyard; it took root and grew into a great yew that later appeared on the arms of the commune of Vertou. Local memory also preserves the legend that, when the people of Herbauges resisted the Gospel, the waters of the lake of Grand-Lieu rose and swallowed their settlements, and that the trembling stone called the Pierre Saint-Martin at Cheix-en-Retz once served as his pulpit, still bearing the imprint of his foot.
In the autumn of 601, while journeying toward Durinum, Martin fell asleep in a clearing and was warned in a dream to return to Vertou; yet he pressed on, took leave of his monks, and died at Durinum on 24 October at the age of seventy-four. The monks of Vertou recovered his body and brought it home for burial. His cult has continued without interruption in the diocese of Nantes; a chapel in the cathedral is dedicated to him, and he is honored as patron of the parish of Vertou.
May Saint Martin of Vertou obtain for us a share in his missionary perseverance, that we too may plant the Cross firmly where the Gospel is still unknown.