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How was Julian mortally wounded during the retreat from Ctesiphon?

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During the retreat from Ctesiphon, Emperor Julian was mortally wounded during a skirmish with Persian forces near Sāmarrāʾ, in present-day central Iraq.1

He was struck by a spear that pierced his liver. According to historical accounts, the weapon was thrown from an unknown source, described as coming from "no one knew whence". Julian died the following night from his injuries.1