Chariot racing was one of the most popular ancient Greek, Roman and Byzantine sports. Both chariot and mounted horse racing were events in the ancient Greek Olympics by 648 BC and were important in the other Panhellenic Games. It continued although chariot racing was often dangerous to both driver and horse, which frequently suffered serious injury and even death. In the Roman Empire, chariot and mounted horse racing were major industries. From the mid-fifteenth century until 1882, spring carnival in Rome closed with a horse race. Fifteen to 20 riderless horses, originally imported from the Barbary Coast of North Africa, were set loose to run the length of the Via del Corso, a long, straight city street; their time was about 2½ minutes.