Chariot racing (harmatodromia, ludi circenses) was one of the most popular ancient Greek, Roman, and Byzantine sports. In Greece, chariot racing played an essential role in aristocratic funeral games from a very early time. With the institution of formal races and permanent racetracks, chariot racing was adopted by many Greek states and their religious festivals. Horses and chariots were very costly. Their ownership was a preserve of the wealthiest aristocrats, whose reputations and status benefitted from offering such extravagant, exciting displays. Their successes could be further broadcast and celebrated through commissioned odes and other poetry. In standard racing practise, each chariot held a single driver and was pulled by four horses, or sometimes two. Drivers and horses risked serious injury or death through collisions and crashes; this added to the excitement and interest for spectators. Most charioteers were slaves or contracted professionals. While records almost invariably credit victorious owners and their horses for winning, their drivers are often not mentioned at all. In the ancient Olympic Games, and other Panhellenic Games, chariot racing was one of the most important equestrian events, and could be watched by unmarried women. Married women were banned from watching any Olympic events but a Spartan noble-woman is known to have trained horse-teams for the Olympics and won two races, one of them as driver. In ancient Rome, chariot racing was the most popular of many subsidised public entertainments, and was an essential component in several religious festivals. Roman chariot drivers had very low social status, but were paid a fee simply for taking part. Winners were celebrated and well paid for their victories, regardless of status, and the best could earn more than the wealthiest lawyers and senators. Racing team managers may have competed for the services of particularly skilled drivers and their horses. The drivers could race as individuals, or under Team colours: Blue, Green, Red or White.