One of the Dioscuri of the Quirinal 

Giovanni Battista Piranesi's etching "One of the Dioscuri of the Quirinal" presents a detailed drawing of a classical sculpture of a Dioscuri (a pair of twin brothers from Roman Mythology, specifically Castor and Pollux) riding a horse. The image focuses on the detail of the human figure and the horse's anatomy. It is inscribed "OPVS PHIDIAE", implying the sculpture was a work of Phidias, the renowned Athenian sculptor. The etching highlights Piranesi's interest in Roman antiquities and his ability to capture the grandeur and detail of classical sculptures.