Helladius of Auxerre
Helladius of Auxerre was the bishop of Auxerre for thirty years from 357 until his death. St. Amator was converted to Christianity, ordained a deacon and tonsured by Helladius, which provides the earliest example of ecclesiastical tonsure mentioned in the religious history of France.
He is venerated as a saint in the Eastern Orthodox Church and Roman Catholic Church, being commemorated on 8 May.