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.
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.