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.
Theodorus Priscianus Theodorus Priscianus (Greek: Θεόδωρος ὁ Πρισκιανός ) was a physician at Constantinople during the 4th century, and the author of the Latin work "Rerum Medicarum Libri Quatuor".