Saint Germanus was born at Auxerre around 389, and studied rhetoric and law at Rome. There he practiced as a lawyer.
The emperor Honorius sent him back to Gaul as a provincial governor, with his headquarters at Auxerre. He also married about this time. In 418 he was chosen to succeed Saint Amator (May 1) as Bishop of Auxerre. From that time on, his faith became deeper, and his prayer more fervent. He gave away his possessions to the poor, and ate coarse barley bread only in the evening. He often fasted for several days, and dressed in simple monastic garb.
Pope Celestine I sent him to Britain in 429 with Saint Lupus of Troyes (July 29) to fight the Pelagian heresy, where they defeated the teachers of this false doctrine. During one of his two trips to Britain Saint Germanus took command of an army and defeated a combined force of Saxons and Picts.
When savage barbarians threatened the city of Armorica (now Brittany), Saint Germanus met their leader, seized his horse’s bridle, and turned him around. After defusing the threat, the saint traveled to Ravenna seeking pardon for the rebels from the emperor Valentian III. He was received with honor, and died there on July 31, 448.
The body of Saint Germanus was brought back to Auxerre for burial. Centuries later, his holy relics were scattered by the Huguenots.