As time went on the magnificence of these spectacles increased. Julius Caesar gave one in which three hundred and twenty combatants fought. Trajan far surpassed this with a show that lasted for one hundred and twenty-three days, and in which ten thousand men fought with each other or with wild beasts for the pleasure of the Roman populace. The gladiators were variously armed, some with sword, shield, and body armor; some with net and trident; some with noose or lasso. The disarmed or overthrown gladiator was killed or spared in response to signals made by the thumbs of the spectators; while the successful combatant was rewarded at first with a palm branch, afterwards with money and rich and valuable presents. [Illustration: ROMAN CHARIOT RACE.] The gladiators were not always passive instruments of Roman cruelty. We have elsewhere described the revolt of Spartacus and his brave struggle for liberty. Other outbreaks took place. During the reign of Probus a revolt of about eighty gladiators out of a school of some six hundred filled Rome with death and alarm. Killing their keepers, they broke into the streets, which they set afloat with blood, and only after an obstinate resistance and ample revenge were they at length overpowered and cut to pieces by the soldiers of the city. But such outbreaks were but few, and the Roman multitude usually enjoyed its cruel sports in safety. We cannot here describe the many remarkable displays made by successive emperors, and which grew more lavish as time went on. Probus, about 280 A.D., gave a show in which the arena was transformed into a forest, large trees, dug up by the roots, being transported and planted throughout its space. In this miniature forest were set free a thousand ostriches, and an equal number each of stags, fallow deer, and wild boars. These were given to the multitude to assail and slay at their will. On the following day, the populace being now safely screened from danger, there were slain in the arena a hundred lions, as many lionesses, two hundred leopards, and three hundred bears. The younger Gordian, in his triumphal games, astonished the Romans by the strangeness of the animals displayed, in search of which the whole known world was ransacked. The curious mob now beheld the graceful forms of twenty zebras, and the remarkable stature of ten giraffes, brought from remote African plains. There were shown, in addition, ten elks, as many tigers from India, and thirty African hyenas. To these were added a troop of thirty-two elephants, and the uncouth forms of the hippopotamus of the Nile and the rhinoceros of the African wilds. These animals, familiar to us, were new to their observers, and filled the minds of their spectators with wonder and awe.