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Marcus /+ Marcellianus
- categories: vir , martyr
- date of birth: ?
- date of death: around 304
- beatification: non-existence
- canonization: non-existence
- other Roman Martyrology days: 18.06.
- other memorial days: non-existence
- order: non-existence
- order founder: non-existence
- forenames: Marcus
- surnames: non-existence
- epithets: non-existence
