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".
Didascaliae Didascaliae are a compilation of production notices for several stage works of ancient Rome. This incomplete record was probably compiled some time around the 1st century BC, and contains notes on the "Stichus" and "Pseudolus" of Plautus (in Manuscript A) and all the plays of Terence (in the manuscript and in the commentary by Aelius Donatus), after which they were sometimes called "Didascaliae Terentianae". The notes contain information about the first performance of the works, games that were played there, the plays' directors and producers (such as Lucius Ambivius Turpio), musical composers, the nature of the musical score, the Roman consuls that year, "et cetera". In some cases, details about subsequent revivals are also preserved.