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In page Maecia Faustina:

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After the brief reigns of her father and brother, the Roman Senate in April appointed two senators, Balbinus and Pupienus, as joint emperors. During their brief reign, Maecia's son became popular with Roman citizens and the joint emperors were forced to adopt the child as their heir. On 29 July 238, Balbinus and Pupienus were both murdered by the Praetorian Guard; later that day her son became the new emperor. There is a possibility that Maecia might have bribed the Guards to murder the joint emperors, so that her son could become emperor.[citation needed]