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".
Potamo of Alexandria Potamo (or Potamon) of Alexandria (Greek: Ποτάμων ὁ Ἀλεξανδρεύς ) was an eclectic philosopher who lived in the Roman era. According to Diogenes Laërtius, Potamo had "not long ago" created an eclectic sect of philosophy, which would mean that he lived sometime around the 2nd century CE. However, the Suda says that Potamo lived in the age of Augustus (late 1st century BC) which, if true, would mean that Laërtius probably copied a statement, without alteration, from an earlier writer.