Vast gangs of slave laborers were thus still dispersed over the peninsula, while others in large numbers were purchased and trained for the amusement of the metropolis. Society in Rome, enervated as it was by vicious pleasures, craved continually for new excitements. Sensuality is a near relation of cruelty; and the more savage the entertainments, the more delightful they were to the curled and scented patricians who had lost the taste for finer enjoyments. Combats of wild beasts were at first sufficient for them, but to see men kill each other gave a keener delight; and out of the thousands of youths who were sent over annually by the provincial governors, or were purchased from the pirates by the slave-dealers, the most promising were selected for the arena. Each great noble had his training establishment of gladiators, and was as vain of their prowess as of his race-horses. The schools of Capua were the most celebrated; and nothing so recommended a candidate for the consulship to the electors as the production of a few pairs of Capuan swords-men in the circus. [Sidenote: B.C. 72-70.] These young men had hitherto performed their duties with more submissiveness than might have been expected, and had slaughtered one another in the most approved methods. But the horse knows by the hand on his rein whether he has a fool for his rider. The gladiators in the schools and the slaves on the plantations could not be kept wholly ignorant of the character of their rulers. They were aware that the seas were held by their friends the pirates, and that their masters were again being beaten out of Asia, from which many of themselves had been carried off. They began to ask themselves why men who could use their swords should be slaves when their comrades and kindred were up and fighting for freedom. They found a leader in a young Thracian robber chief, named Spartacus, who was destined for the amphitheatre, and who preferred meeting his masters in the field to killing his friends to make a Roman holiday. Spartacus, with two hundred of his companions, burst out from the Capuan "stable," seized their arms, and made their way into the crater of Vesuvius, which was then, after the long sleep of the volcano, a dense jungle of wild vines. The slaves from the adjoining plantations deserted and joined them. The fire spread, Spartacus proclaimed universal emancipation, and in a few weeks was at the head of an army with which he overran Italy to the foot of the Alps, defeated consuls and praetors, captured the eagles of the legions, wasted the farms of the noble lords, and for two years held his ground against all that Rome could do.