What roman author described the technique of Opus quadratum?
Opus quadratum Opus quadratum is an ancient Roman construction technique, in which squared blocks of stone of the same height were set in parallel courses, most often without the use of mortar. The Latin author Vitruvius describes the technique.
Macrobius Macrobius, fully Macrobius Ambrosius Theodosius, also known as Theodosius, was a Roman provincial who lived during the early fifth century, at the transition of the Roman to the Byzantine Empire, and when Latin was as widespread as Greek among the elite. He is primarily known for his writings, which include the widely copied and read "Commentarii in Somnium Scipionis" ("Commentary on the Dream of Scipio"), which was one of the most important sources for Platonism in the Latin West during the Middle Ages, the "Saturnalia", a compendium of ancient Roman religious and antiquarian lore, and "De differentiis et societatibus graeci latinique verbi" ("On the Differences and Similarities of the Greek and Latin Verb"), which is now lost.