Materni
Martyrological notice
The historical Roman Martyrology commemorates Materni on 18 July. The Latin notice identifies the record as bishop. The source places the commemoration at Mediolani.
Historical martyrology witness · Martyrologium Romanum (Latin historical edition)
Mediolani sancti Materni Episcopi, qui, sub Maximiano Imperatore, pro fide Christi et pro Ecclesia sibi commissa, in carcerem detrusus et saepe verberibus caesus est; ac tandem, multis confessionibus clarus, obdormivit in Domino.