Vitruvius, in full Marcus Vitruvius Pollio   (flourished 1st century bc), Roman architect, engineer, and author of the celebrated treatise De architectura (On Architecture), a handbook for Roman architects. Little is known of Vitruvius’ life, except what can be gathered from his writings, which are somewhat obscure on the subject. Although he nowhere identifies the emperor to whom his work is dedicated, it is likely that the first Augustus is meant and that the treatise was conceived after 27 bc. Since Vitruvius describes himself as an old man, it may be inferred that he was also ...