of Ganymede, often depicted on Greek vase paintings from the 5th century BCE. Images of the hoop are sometimes presented in the context of ancient Greek pederastic tradition. Ancient Rome and Byzantium During the Roman Empire, circa 100-300 AD, the Romans learned hoop driving from the Greeks and generally held the sport in high regard. The Latin term for hoop is also "trochus", at times referred to as the "Greek hoop". The stick was known as a "clavis" or "radius", had the shape of a key, and was made of metal with a wooden handle. Roman hoops were fitted with metal rings that slid freely along the rim. According to Martial, this was done so that the tinkling of the rings would warn passers by of the hoop's approach: "Why do these jingling rings move about upon the rolling wheel? In order that the passers-by may get out of the way of the hoop."(14. CLXIX) He also indicates that the metal tires of wooden cart wheels could be used as hoops: "A wheel must be protected. You make me a useful present. It will be a hoop to children, but to me a tyre for my wheel."(14. CLXVIII) Martial also mentions the sport was practised by Sarmatian boys, who rolled their hoops on the frozen Danube river. According to Strabo, one of the popular Roman venues for practising the sport was the Campus Martius, which was large enough to accommodate a wide variety of activities. The Roman game was to roll the hoop while throwing a spear or stick through it. For Romans, this was more an entertainment and military development, not a philosophical activity. Several ancient sources praise the sport. According to Horace, hoop driving was one of the manly sports. Ovid in his Tristia is more specific, putting the sport in the same category with horsemanship, javelin throwing and weapon practice: "Usus equi nunc est, levibus nunc luditur armis, Nunc pila, nunc celeri volvitur orbe trochus." It was also presented as a virtue in the Distichs of Cato, which enjoin youth to "Trocho lude; aleam fuge" ("Play with the hoop, flee the dice"). A 2nd-century medical text by Antyllus, preserved in an anthology of Oribasius, Emperor Julian's physician, describes hoop rolling as a form of physical and mental therapy. Antyllus indicates that at first the player should roll the hoop maintaining an upright posture, but after warming up