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.
De Arte Gladiatoria Dimicandi De Arte Gladiatoria Dimicandi was written by Italian fencing master Filippo Vadi at some time between 1482 and 1487. It consists of an opening prologue describing the art of fencing followed by colored plates illustrating specific techniques for the longsword, dagger, pollaxe, spear and club. While much of what he describes closely follows the work of Fiore dei Liberi, author of "Flos Duellatorum", Vadi's work also differs in some respects, including his footwork and several original techniques of his own.