Januarius was a bishop of Benevento who lived during the late third and early fourth centuries. Born in Benevento, he eventually served as a diocesan bishop and is remembered as a martyr who died during the Great Persecution under Emperor Diocletian. While historical details of his life are scarce, he is celebrated as a significant figure in the Neapolitan church. He is most widely recognized as the principal patron saint of Naples, where his memory is preserved through various traditions and the veneration of his relics.