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Step-by-step explanation:
Ammianus Marcellinus (occasionally anglicised as Ammian[1][2]) (born c. 330, died c. 391 – 400) was a Roman soldier and historian who wrote the penultimate major historical account surviving from antiquity (preceding Procopius). His work, known as the Res Gestae, chronicled in Latin the history of Rome from the accession of the Emperor Nerva in 96 to the death of Valens at the Battle of Adrianople in 378, although only the sections covering the period 353 to 378 survive.
Ammianus served as an officer in the army of the emperors Constantius II and Julian. He served in Gaul (Julian) and in the east (twice for Constantius, once under Julian). He professes to have been "a former soldier and a Greek" (miles quondam et graecus),[9] and his enrollment among the elite protectores domestici (household guards) shows that he was of middle class or higher birth. Consensus is that Ammianus probably came from a curial family, but it is also possible that he was the son of a comes Orientis of the same family name. He entered the army at an early age, when Constantius II was emperor of the East, and was sent to serve under Ursicinus, governor of Nisibis in Mesopotamia, and magister militum. Ammianus campaigned in the East twice under Ursicinus
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