Postumus (disambiguation)
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Postumus (Marcus Cassianius Latinius Postumus, died 269) was a Roman usurper and founder of the Gallic Empire.
Postumus may also refer to:
- Agrippa Postumus (12 BC – 14 AD), son of Marcus Vipsanius Agrippa
- Postumus Junior (died 268), alleged son of the Gallic emperor
- Postumus (praenomen), Roman praenomen