Helladius of Auxerre (died 387) was the bishop of Auxerre for thirty years from 357 until his death.Watkins, Basil. The Book of Saints: A Comprehensive Biographical Dictionary, Bloomsbury Publishing, 2015, p. 304 St. Amator (died 418) 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.Goyau, Georges. "Sens." The Catholic Encyclopedia Vol. 13. New York: Robert Appleton Company, 1912
He is venerated as a saint in the Eastern Orthodox Church and Roman Catholic Church, being commemorated on 8 May. Ὁ Ἅγιος Ἑλλάδιος Ἐπίσκοπος Ὡξέρρης. 8 Μαΐου. ΜΕΓΑΣ ΣΥΝΑΞΑΡΙΣΤΗΣ.May 8 . The Roman Martyrology.
References
Sources Catholic Encyclopedia, s.v. Diocese of Sens