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.
Dio Chrysostom Dio Chrysostom ( ; Greek: Δίων Χρυσόστομος "Dion Chrysostomos"), Dion of Prusa or Dio Cocceianus (c. 40 CE – c. 115 CE), was a Greek orator, writer, philosopher and historian of the Roman Empire in the 1st century. Eighty of his "Discourses" (or "Orations"; Λόγοι ) are extant, as well as a few Letters and a funny mock essay "In Praise of Hair", as well as a few other fragments. His surname "Chrysostom" comes from the Greek "chrysostomos" (χρυσόστομος), which literally means "golden-mouthed". He should not be confused with the Roman historian Cassius Dio, nor with the 4th-century bishop John Chrysostom of Constantinople.