Vegetius

Publius (or Flavius) Vegetius Renatus, known as Vegetius (Latin: [u̯ɛˈɡɛtiʊs]), was a writer of the Later Roman Empire (late 4th century). Nothing is known of his life or station beyond what is contained in his two surviving works: Epitoma rei militaris (also referred to as De re militari), and the lesser-known Digesta Artis Mulomedicinae, a guide to veterinary medicine. He identifies himself in the opening of his work Epitoma rei militaris as a Christian.

Notable works: De re militari, Digesta artis mulomedicinae

Source: Wikipedia — https://en.wikipedia.org/wiki/Vegetius