The Olympic Games were of greater efficacy than the amphictyonic council in promoting a spirit of union among the various branches of the Greek race, and in keeping alive a feeling of their common origin. They were open to all persons who could prove their Hellenic blood, and were frequented by spectators from all parts of the Grecian world. They were celebrated at Olympia, on the banks of the Alpheus, in the territory of Elis. The origin of the festival is lost in obscurity; but it is said to have been revived by Iphitus, king of Elis, and Lycurgus the Spartan legislator, in the year 776 B.C.; and, accordingly, when the Greeks at a later time began to use the Olympic contest as a chronological era, this year was regarded as the first Olympiad. It was celebrated at the end of every four years, and the interval which elapsed between each celebration was called an Olympiad. The whole festival was under the management of the Eleans, who appointed some of their own number to preside as judges, under the name of the Hellanodicae. During the month in which it was celebrated all hostilities were suspended throughout Greece. At first the festival was confined to a single day, and consisted of nothing more than a match of runners in the stadium; but in course of time so many other contests were introduced, that the games occupied five days. They comprised various trials of strength and skill, such as wrestling boxing, the Pancratium (boxing and wrestling combined), and the complicated Pentathlum (including jumping, running, the quoit, the javelin, and wrestling), but no combats with any kind of weapons. There were also horse-races and chariot-races; and the chariot-race, with four full-grown horses, became one of the most popular and celebrated of all the matches.