The ancient Olympic Games were originally a festival, or celebration, of and for Zeus; events such as a footrace, a javelin contest, and wrestling matches were added later. The Olympic Games (Ancient Greek: Ὀλύμπια, Olympia, "the Olympics"; also Ὀλυμπιάς, Olympias, "the Olympiad") were a series of athletic competitions among representatives of city-states and one of the Panhellenic Games of ancient Greece. They were held in honor of Zeus, and the Greeks gave them a mythologicalorigin. The first Olympics is traditionally dated to 776 BC. They continued to be celebrated when Greece came under Roman rule, until the emperor Theodosius I suppressed them in AD393 as part of the campaign to impose Christianity as the State religion of Rome. The games were held every four years, or olympiad, which became a unit of time in historical chronologies.