The Rerum gestarum libri XXXI (commonly abbreviated as Res gestae) is a historical work written by the Roman officer Ammianus Marcellinus beginning around 380 and likely completed by 392.
The title is not original. The term Res gestae was later used by Priscian of Caesarea. and translates to "The Things Accomplished." The manuscript Vaticanus Latinus 1873 labels it Rerum gestarum libri, though a more accurate title might be Rerum gestarum libri ab excessu Neruae.
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Ammianus Marcellinus, occasionally anglicized as Ammian (Greek: Αμμιανός Μαρκελλίνος; born c. 330, died c. 391 – 400), was a Greek and Roman soldier and historian who wrote the penultimate major historical account surviving from antiquity (preceding Procopius). Written in Latin and known as the Res gestae, his work chronicled the history of Rome from the accession of Emperor Nerva in 96 to the death of Valens at the Battle of Adrianople in 378. Only the sections covering the period 353 to 378 survive.