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How long did Julian rule as sole Roman emperor?
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Julian
Julian the Apostate, detail of a marble statue; in the Louvre, Paris.
Julian, often referred to as "the Apostate," ruled as sole Roman emperor for approximately 18 to 20 months, from the end of 361 until his death on June 26, 363.12
It is important to distinguish him from Marcus Didius Severus Julianus, a different Roman leader who served as emperor for only a few months in 193. Julian the Apostate ascended to the position of sole Augustus following the death of Constantius II in November 361 and maintained his rule until he was fatally wounded during a military campaign against the Persians.312