Question: What roman author described the technique of Opus quadratum?
Sentence (from "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".
Relevant evidence: Yes