[1] The hagiographer Alban Butler (1710–1773) wrote in his Lives of the Fathers, Martyrs, and Other Principal Saints under June 20, St. Bain, Bishop of Terouanne, (Now St. Omer), and Abbot of St. Vandrille’s.
Solitude, “which nourishes prayer as a mother does her child,” as St. John Damascen says, being always the ruling inclination of our saint, he resigned his bishopric, and retiring to the abbey of Fontenelle or St. Vandrille's, in Normandy, put on the monastic habit, as he was already possessed perfectly of the spirit, and some time after was chosen the fifth abbot of that house from St. Wandrille, in 1700 .
Pepin, duke of the French, having founded or considerably augmented the abbey of Fleury, now called St. Bennet's on the Loire, situated nine leagues above Orleans, he committed the same to the direction of St. Bain, in 706.
[2] Jacques Paul Migne (1800–1875) in his Encyclopédie théologique: Dictionnaire de philosophie catholique wrote, Saint Bain, bishop of Thérouanne in the 7th century, was born to an illustrious family, and was named Theodericus Buinus.
He made several translations, and went to Rome where Pope Sergius I showered him with precious gifts and gave him marks of his high esteem and friendship.
Finally, overwhelmed by the fatigue of the pastoral ministry, and jealous of imitating so many holy bishops whose worship he had made honorable, Saint Bain resigned from his office in 697 and chose for the place of his retreat his dear abbey of Fontenelle, in which he had once spent days so full of meditation and peace.
The city of Calais having been the favorite place for preaching by Bain, and this holy bishop having reaped great fruits of conversion there, the Calaisians have always considered him as their apostle, and honored him as their patron.