Marcellus of Paris was a 5th-century Catholic bishop who served as the ninth leader of the see in Paris. Born on the île de la Cité, he was recommended for service due to his prayerful life and virtuous character. After being ordained as a reader by Bishop Prudentius, he eventually rose to the priesthood and succeeded his mentor as bishop. His influential preaching helped convert many pagans to Christianity during his tenure in Roman Gaul.