About “Res gestae”
The Rerum gestarum libri XXXI is a historical work composed by the Roman officer Ammianus Marcellinus, beginning around 380 and likely completed by 392. It provides a chronicle of events in the later Roman Empire, focusing on military and political affairs. (Summary adapted from Wikipedia, CC BY-SA 4.0.)
Some summaries adapted from Wikipedia, CC BY-SA 4.0.