Yes, Ammianus Marcellinus died in the 4th century. He was a Roman historian who lived from around 330 to 395 AD. He is best known for his work Res Gestae, which is a history of the Roman Empire from 353 to 378 AD. Marcellinus died in 395 AD, after being captured by the Goths.
Exploring the Chronicles: Unraveling Ammianus Marcellinus's Ancient World