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In 367 Emperor Valentinian I was striken by a mysterious illness during a campaign against the Allemani... Imperial court proposed Magister Memoriae Julius Rusticus as Emperor while the army proposed Magister Equituum Severus while his son Gratian was only 8 years old... In OTL Valentinian recovered and designated Gratian as his succesor by naming him co-Augustus (which was higly unusual by that time...)
WI Valentinian had died in 367? Could this diputed election lead to a civil war? How is Eastern Empire reacts to this civil war? I guess that Valens might have supported the 8-year old Gratian (if he wished to keep the purple in the family