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In 453 Senator Petronius Maximus and Chamberlain Heraclius plotted against Magister Militum Aetius who was celebrating the betrothal of his son Gaudentius to Valentinian's daughter Placidia...
Valentinian was enlisted to the plot in early 454 because he felt intimidated by Aetius... (Aetius had supported the usurper Johannes earlier in his reign and Valentinian was afraid of a revolt from Aetius)
So in 21 Septembre 454 Valentinian killed Aetius with his own hands in Ravenna while the General was delivering his financial account to him...
WI Aetius was informed somehow for the assassination attempt and escaped death?
How would Aetius reacted to the attempted murder? Could he depose the incompetent Valentinian III and proclaim himself Emperor? (Of course this butterflies away the disastrous reigns of Petronius Maximus and some of his succesors...)