Desultor

In antiquity, the term "apobates" (Greek, "one who gets off") or "desultor" (Latin "one who leaps down") has been applied to individuals skilled at leaping from one horse or chariot to another.
As early as the Homeric times, we find the description of a man, who keeps four horses abreast at full gallop, and leaps from one to another, amidst a crowd of admiring spectators. Eustathius on Homer's Iliad, Lib. IV, assures us that riders might have up to six horses all abreast. In the games of the Roman circus, this sport was also very popular. The Roman desultor generally rode only two horses at the same time, sitting on them without a saddle, and vaulting upon either of them at his pleasure. He wore a hat or cap made of felt. The taste for these exercises was carried to so great an extent, that young men of the highest rank not only drove bigae and quadrigae in the circus, but exhibited these feats of horsemanship.