Born in Ireland, he was a brother of Saint Wasnon, (to whom a church is dedicated in Condé-sur-l'Escaut). Gobain accompanied Fursey to France. Some accounts have him staying at the Abbey of Saint Vincent in Picardy, or the abbey of Corbény in Champagne, before settling in a hermitage in the forest of Voas, near the present Saint-Gobain. There he brought forth a spring by thrusting his pilgrim's staff into the ground.
In 670, Gobain was beheaded by marauders, and buried in his oratory, which became a place of pilgrimage. His feast day is observed on 20 June.