These six events comprised the ἀγὼν ἱππικός at Olympia, Delphi, Nemea, Corinth, Athens, and elsewhere, as opposed to the ἀγὼν γυμνικός.[1823] The distinction between horses and colts was apparently a matter which was decided by the Hellanodikai at Olympia. Thus, Pausanias recounts how the Spartan victor Lykidas entered a pair of colts for the chariot-race, and that one of them was rejected by the judges; he thereupon entered both for the race with full-grown horses and won it.[1824] Though such a story does not fit the date of Lykidas, who won before the colt-race was introduced at Olympia, it shows the method of selection.[1825] The race in which the chariot was drawn by four full-grown horses (ἵππων τελείων δρόμος) was introduced, as we have seen, in Ol. 25. The contestants drove twelve times round the course, a distance of seventy-two stades or over eight miles.[1826] Pausanias mentions the monuments of eighteen such victors at Olympia for nineteen victories. The race in which the chariot was drawn by four colts (πώλων ἅρμα) was introduced in Ol. 99 (= 384 B. C.),[1827] and extended eight times round the course, or about 5.5 miles.[1828] Pausanias mentions the monuments of only two such victors at Olympia.[1829] The race in which the chariot was drawn by pairs of full-grown horses (συνωρίς) was introduced in Ol. 93 (408 B. C.) and extended eight times round the course.[1830] Pausanias mentions but one victor in this event at Olympia[1831] and an Olympic victress who had a statue erected to her in Sparta for such a victory.[1832] This was probably the original chariot-race at Olympia revived in Ol. 93, since the two-horse chariot was the historical descendant of the Homeric war-chariot.[1833] Panathenaic vases show that this race existed at Athens in the sixth century B. C., side by side with the four-horse chariot-race and horseback-race. The earliest of these vases, the so-called Burgon vase in the British Museum,[1834] was a prize there for this event. The race in which the chariot was drawn by a pair of colts (συνωρὶς πώλων) was introduced at Olympia in the third century B. C., in Ol. 129 (= 264 B. C.),[1835] and extended three times around the course. Pausanias mentions no monument erected to a victor in this race. The horse-race (ἵππος κέλης) was instituted in Ol. 33 (= 648 B. C.)[1836], and the foal-race (πῶλος κέλης) nearly four centuries later, in Ol. 131 (256 B. C.).[1837] Neither of these races was known to Homer, for κελετίζειν in the Iliad,[1838] as we saw in Chapter I, refers only to the acrobatic feat of vaulting from the back of one horse to that of another. Pausanias mentions monuments erected to eight victors (for nine victories) in the regular horse-race at Olympia. We conclude from a passage of his work[1839] that the riding-race consisted of one lap only or six stades, about two-thirds of a mile. A mule chariot-race (ἀπήνη) was introduced in Ol. 70 (= 500 B. C.), and a trotting-race with mares (κάλπη) in Ol. 71 (= 496 B.