Ammianus Marcellinus, the esteemed ancient historian, is best known for his work 'Res Gestae,' commonly referred to in English as 'The Roman History.' His comprehensive account serves as a significant historical source for the period from the reign of the Emperor Nerva in 96 AD to the death of the Emperor Valens at the Battle of Adrianople in 378 AD, although only the books covering the events from 353 to 378 AD survive. Born between 330 and 335 AD, likely in Antioch on the Orontes, Marcellinus positioned himself as a participant-observer, as he was a former soldier in the Roman army. This status provided him with the insight and firsthand experiences that informed his work. His writing, intrinsically detailed and vibrant, offers an invaluable perspective on the political, military, and social facets of the late Roman Empire, albeit with the considered bias of a traditional Roman aristocrat. Marcellinus' literary style, complex and often challenging due to his adherence to classical Latin in an age of linguistic transition, reveals a depth of education and carries a distinct rhetorical flair, reflective of the historiographical methods of his time (Matthews, 1989). His work remains an essential reference point for scholars studying the late Roman Empire, providing both a chronicle of events and a rich cultural and ideological tapestry of the era in which he lived.