The Taraxippus was a presence, either a ghost

Ghost

In traditional belief and fiction, a ghost is the soul or spirit of a deceased person or animal that can appear, in visible form or other manifestation, to the living. Descriptions of the apparition of ghosts vary widely from an invisible presence to translucent or barely visible wispy shapes, to...

 or a site, that frightened the horse

Horse

The horse is one of two extant subspecies of Equus ferus, or the wild horse. It is a single-hooved mammal belonging to the taxonomic family Equidae. The horse has evolved over the past 45 to 55 million years from a small multi-toed creature into the large, single-toed animal of today...

s during races at the Panhellenic Games

Panhellenic Games

Panhellenic Games is the collective term for four separate sports festivals held in ancient Greece. The four Games were:-Description:The Games took place in a four-year cycle known as the Olympiad, which was one of the ways the Greeks measured time...

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At Olympia

Olympia, Greece

Olympia , a sanctuary of ancient Greece in Elis, is known for having been the site of the Olympic Games in classical times, comparable in importance to the Pythian Games held in Delphi. Both games were held every Olympiad , the Olympic Games dating back possibly further than 776 BC...

, the Taraxippos Olympios was identified variously. Some said it was the ghost of Oenomaus

Oenomaus

In Greek mythology, King Oenomaus of Pisa, the father of Hippodamia, was the son of Ares, either by the naiad Harpina or by Sterope, one of the Pleiades, whom some identify as his consort instead...

, harming chariot racers as he had harmed suitors of Hippodamia

Hippodamia

Hippodamia was a daughter of King Oenomaus and wife of Pelops with whom her offspring were Thyestes, Atreus, Pittheus, Alcathous, Troezen, Hippalcimus, Copreus, Astydameia, Nicippe, Eurydice and others....

. Others say it was a tomb of Myrtilus

Myrtilus

In Greek mythology, Myrtilus was a divine hero, a son of Hermes on Theobule , and charioteer of King Oenomaus of Pisa in Elis, on the northwest coast of the Peloponnesus....

, who caused the death of Oenomaus. Others said was the tomb of an Earth-born giant Ischenus. Pausanias

Pausanias (geographer)

Pausanias was a Greek traveler and geographer of the 2nd century AD, who lived in the times of Hadrian, Antoninus Pius and Marcus Aurelius. He is famous for his Description of Greece , a lengthy work that describes ancient Greece from firsthand observations, and is a crucial link between classical...

 lists several other persons whose ghosts might be responsible.

The race-course [of Olympia] has one side longer than the other, and on the longer side, which is a bank, there stands, at the passage through the bank, Taraxippos, the terror of the horses. It is in the shape of a round altar and there the horses are seized by a strong and sudden fear for no apparent reason, and from the fear comes a disturbance. The chariots generally crash and the charioteers are injured. Therefore the drivers offer sacrifices and pray to Taraxippos to be propitious to them.

At the Isthmian Games

Isthmian Games

The Isthmian Games or Isthmia were one of the Panhellenic Games of Ancient Greece, and were named after the isthmus of Corinth, where they were held...

, the Taraxippos Isthmios was the ghost of Glaucus of Pontiae, who was torn apart by his own horses.

The Taraxippos Nemeios caused horses to panic during the Nemean Games

Nemean Games

The Nemean Games were one of the four Panhellenic Games of Ancient Greece, and were held at Nemea every two years ....

:

At Nemea of the Argives there was no hero

Greek hero cult

Hero cults were one of the most distinctive features of ancient Greek religion. In Homeric Greek, "hero" refers to a man who was fighting on either side during the Trojan War...

who harmed the horses, but above the turning-point of the chariots rose a rock, red in color, and the flash from it terrified the horses, just as though it had been fire. But the Taraxippos at Olympia is much worse for terrifying the horses.