His Acts, composed in the thirteenth century and unreliable, say he was born at Celeia (Cilli, Styria), made a pilgrimage to Rome, went as missionary to Noricum, became Archbishop of Laureacum (Lorch, near Passau), and suffered martyrdom under Numerianus (283-4). It is historically certain that Maximilian was a missionary in Noricum during the latter half of the third century, founded the church of Lorch, and suffered martyrdom. His cult dates at least from the eighth century. In that century, Saint Rupert built a church in his honour at Bischofshofen, and brought his relics thither. They were transferred to Passau in 985. His feast is celebrated 12 October, at some places 29 October.