His legend states that he was the second bishop of Évreux, and that he died a martyr at Acquigny with his brother, who was his deacon.
They attempted to make converts to Christianity amongst the ranks of the barbarian armies, but failed.
The brothers were sent by Pope Damasus I to preach in Gaul instead, to continue the work of Saint Taurinus (Taurin) in the region.
They traveled to Gaul with two priests, Mark and Etherius, passing through Auxerre, Sens, and Paris until they reached Évreux, where Maximus became bishop (the years of his episcopate are sometimes given as 411–440, which conflict with the traditional date of his martyrdom).
On its southern face is a carved image of a saint carrying the crozier of a bishop.