The ancient Olympic Games started in Olympia, in southwestern Greece, around 776 BCE. These games were held every four years as part of a religious festival honoring Zeus, the king of the gods. Olympia was a sacred site where athletes from various Greek city-states gathered to compete and pay tribute to the gods. The games continued for centuries and were a major event in ancient Greek culture, also involving a sacred truce to allow safe travel for participants and spectators.