ClipArt ETC
"A rider in the Roman games, who generally rode two horses at the same time, sitting on them without a saddle, and vaulting upon either of them at is pleasure. The annexed woodcut shows three figures of desultores." — Smith, 1873.

Desultor

"A rider in the Roman games, who generally rode two horses at the same time, sitting on them without…

"While his horse is going at full speed, he jumps over a rope extended across the ring, and regains his footing on the saddle without difficultly. To do this, he has only to leap straight up as he comes to the rope, for his inertia bears him along in the same direction as the horse." —Quackenbos 1859

Inertia Demonstration

"While his horse is going at full speed, he jumps over a rope extended across the ring, and regains…