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".
Juventinus Albius Ovidius Juventinus Albius Ovidius was the name of the author of thirty-five distichs titled "Elegia de Philomela", containing a collection of those words which are supposed to express appropriately the sounds uttered by birds, quadrupeds, and other animals. For example: