Foundation of the Church at Le Mans
The decisive moment in the tradition is the conversion of the city's principal citizen. Having witnessed the healing of the blind man at his gate, the prince requested baptism; after catechesis and a three-day fast, he and his family were baptized, and the greater part of his subjects followed their example. In gratitude he gave over part of his own residence to serve as a church, which the tradition remembers as the first cathedral of Le Mans.
From this foundation Julian is said to have served as bishop for many years, caring for his people and continuing to preach until idolatry had been displaced throughout the territory of the Cenomani. By one account preserved in the Western tradition, he withdrew in his old age to live as a hermit by the Sarthe. He died in extreme old age after a long episcopate.