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In February 421 the Western Roman Emperor Honorius elevated his brother-in-law Constantius as co-emperor of the West (Honorius being ill at the time by dropsy or edema of the lungs intended that Constantius would have succeed him in case of his death)
However the Eastern Roman Emperor Theodosius II who was Honorius's nephew refused to recognise Constantius's Imperial Status...
Constantius was furious and started planning a campaign against Theodosius II in order to force him to recognise him as co-Emperor of the West...
In OTL Constantius III died 7 months after his elevation to co-emperor before he could launch the attack against Theodosius II thus leaving his son Valentinian III to succeed the childless Honorius...
WI He had attacked ERE sparking another Roman civil war?
How is that changing History? Any thoughts?
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