Germanus was one of the six dukes, entrusted by the emperor with the government of the Gallic provinces. He resided at Auxerre. At length he incurred the displeasure of Bishop Amator by hanging hunting trophies on a certain tree, which in earlier times had been the scene of pagan worship. Amator remonstrated with him in vain. One day when the duke was absent, the bishop had the tree cut down and the trophies burnt. Fearing the anger of the duke, who wished to kill him, he fled and appealed to the prefect Julius for permission to confer the tonsure on Germain. This being granted, Amator, who felt that his own life was drawing to a close, returned. When the duke came to the church, Amator caused the doors to be barred and gave him the tonsure against his will, telling him to live as one destined to be his successor, and forthwith made him a deacon. When in a short time Amator died, Germain was unanimously chosen to succeed him as bishop. Germanus subsequently wrote a biography of Amator. In the Middle Ages, a certain Stephen also composed a life of Amator, but it is considered a work of fiction.