The Palio di Siena (known locally simply as Il Palio) is a horse race that is held twice each year, on July 2 and August 16, in Siena, Italy. Ten horses and riders, bareback and dressed in the appropriate colours, represent ten of the seventeen contrade, or city wards. The Palio held on July 2 is named Palio di Provenzano, in honour of the Madonna of Provenzano, who has a church in Siena. The Palio held on August 16 is named Palio dell'Assunta, in honour of the Assumption of Mary.
The race itself, in which the jockeys ride bareback, circles the Piazza del Campo, on which a thick layer of dirt has been laid, three times and usually lasts no more than 90 seconds. It is not uncommon for a few of the jockeys to be thrown off their horses while making the treacherous turns in the piazza, and indeed, it is not unusual to see unmounted horses finishing the race without their jockeys.