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.
Polyaenus Polyaenus or Polyenus ( ; see ae (æ) vs. e; Greek: Πoλύαινoς , "Polyainos", "much-praised") was a 2nd-century Macedonian author, known best for his "Stratagems in War" (in Greek, Στρατηγήματα), which has been preserved. The "Suda" calls him a rhetorician, and Polyaenus himself writes that he was accustomed to plead causes before the emperor. Polyaenus dedicated "Stratagems in War" to the two emperors Marcus Aurelius (161–180 CE) and Verus (161–169 CE), while they were engaged in the Parthian war (162–165 CE), about 163 CE, at which time he was too old to accompany them in their campaigns.