Saturninus (253-268)
Encyclopedia
Saturninus is mentioned in the Historia Augusta as a Roman usurper
Roman usurper
Usurpers are individuals or groups of individuals who obtain and maintain the power or rights of another by force and without legal authority. Usurpation was endemic during roman imperial era, especially from the crisis of the third century onwards, when political instability became the rule.The...

 during the reign of emperor Gallienus
Gallienus
Gallienus was Roman Emperor with his father Valerian from 253 to 260, and alone from 260 to 268. He took control of the Empire at a time when it was undergoing great crisis...

 (253-268). It is very probably a fictional construction by the author of the Historia Augusta.
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