"The world's oldest sports spectacular, the first known Olympiad was held in 776 B.C.E. in Olympia, Greece. It is believed the festivals began before 1400 B.C.E. The modern games, which until recently were held roughly every four years in different countries, were revived in 1896 by Baron Pierre de Coubertin of France. Those 1896 summer games took place in Athens, with 13 nations sending about 300 male athletes to compete in 42 events and 10 different sports. Now nearly 200 nations send thousands of male and female athletes to the Olympics, and hundreds of millions watch the events on television. Some winter sports were included in early years of the modern Olympics, but the Winter Games as a separate event didn't begin until 1924."
Olympic Games. (2015). In H. Henderson (Ed.), Holidays, festivals & celebrations of the world dictionary: detailing more than 3,300 observances from all 50 states and more than 100 nations (5th ed.). Detroit, MI: Omnigraphics, Inc. Retrieved from http://sc4.idm.oclc.org/login?qurl=https://search.credoreference.com/content/entry/hfcwd/olympic_games/0?institutionId=5065