The ancient Greek festival dedicated to the god Zeus was known as the Olympic Games. Held every four years in Olympia, the festival began in 776 BCE and celebrated athletic prowess and competition among city-states in ancient Greece. It featured a variety of sports, including running, wrestling, and chariot racing. The Olympic Games were not only a display of physical skill but also included religious ceremonies, music, and cultural events. They reinforced a sense of unity among the Greek city-states and allowed participants to gain glory and honor, laying the foundational principles of sports competitions that continue today.