Ammianus Marcellinus was a Greek and Roman soldier and historian, born around 330 AD in Antioch, in present-day Turkey. He is best known for his historical work Res Gestae, which is one of the last major accounts of ancient Roman history still in existence. As a soldier, Ammianus had firsthand experience of the military and political dynamics of his time, and his writings offer valuable insights into the Roman Empire during the late 4th century. His history covers significant events from the reign of Emperor Nerva in AD 96 to the death of Emperor Valens in AD 378, with a particular focus on military affairs and the political turmoil of the period. Ammianus's work is known for its detailed and often critical portrayal of Roman leaders and the social and political challenges of the empire. He died in Rome, Italy, though the exact date of his death remains unclear. His contributions remain significant in the study of Roman history and historiography.