Marcellus of Trier

Saint Marcellus of Trier is venerated as a bishop of the city of Trier, in present-⁠day Germany; the calendar notes, however, that he may instead have been a bishop of Tongeren in Belgium. The surviving sources say no more about him, nor when he lived, beyond placing him in the early centuries.

He is a saint of the undivided Church, commemorated on 4 September (new style, Western calendar). He is not to be confused with Saint Marcellus of Chalon, a martyr remembered on the same day.