Eustochius was descended from an illustrious family of Auvergne, and, according to Gregory of Tours, was a man of eminent virtue. In 444 he succeeded Brice as Bishop of Tours.
A member of the distinguished Auvergne clan, Eustochius was celebrated for his exemplary virtues. In 444, he ascended to the bishopric of Tours, following Brice's tenure.