What roman author described the technique of Opus quadratum?
Vitruvius Marcus Vitruvius Pollio (born c. 80–70 BC, died after c. 15 BC), commonly known as Vitruvius, was a Roman author, architect, civil engineer and military engineer during the 1st century BC, known for his multi-volume work entitled "De architectura". His discussion of perfect proportion in architecture and the human body, led to the famous Renaissance drawing by Da Vinci of "Vitruvian Man".
Hermeneumata The Hermeneumata (Greek: Ἑρμηνεύματα ; also known as the Hermeneumata Pseudodositheana) are anonymous instructional manuals written in the Third century to teach the Greek language to Latin-speaking people in the Roman Empire, and to teach Latin to Greek-speakers. The word "Hermeneumata" means "translation" or "interpretation".