Trigarium
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The trigarium was an equestrian training ground in the northwest corner of the Campus Martius in ancient Rome. Its name was taken from the triga, a three-horse chariot.
Charioteer of the Blue Team with horse (3rd-century mosaic)
Victory in a triga on a Republican denarius (111/110 BC)
Two trigae teams on an Etruscan cinerary urn
Cinerary altar depicting the four-horse chariot in which Proserpina was abducted by the ruler of the underworld (2nd century)
Equirria
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The Equirria were two ancient Roman festivals of chariot racing, or perhaps horseback racing, held in honor of the god Mars, one 27 February and the other 14 March.
Trigarium
…as a trophy for the coming year, and a runner carried the horse's tail to the Regia to drip its blood on the sacred hearth of Rome. The races of the Equirria on February 27 and March 14, also celebrated for Mars, may have been held at the trigarium as well, and possibly events for the ludi tarentini, which…
Denarius depicting the helmeted head of Mars, with Victory driving a biga on the reverse (issued 88 BC by Gnaeus Cornelius Lentulus Clodianus)