When were the first Greek Olympic Games?
Ancient Olympic Games
776 BC
The ancient Olympic Games were originally a festival, or celebration of and for Zeus; later, events such as a footrace, a javelin contest, and wrestling matches were added. The Olympic Games  (Ancient Greek: Ὀλύμπια, Olympia,[1][2][3][4][5][6] "the Olympics"; also Ὀλυμπιάς, Olympias,[7][4][5][6] "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 mythological origin. The first Olympics is traditionally dated to 776 BC.[8] 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.