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.
Roman Pontifical The Roman Pontifical, in Latin the " Pontificale Romanum", is the Latin Catholic liturgical book that contains the rites performed by Bishops.