1920: First Olympic flag and oath in Antwerp
Less than two years after the end of World War I, the Olympics were held in Antwerp. The Olympic flag, designed in 1913, was flown for the first time. The six colors on the flag - the white background plus blue, yellow, black, green and red rings - contain the colors of all other national flags. The athletes' Olympic oath (pictured) was also introduced as a commitment to fair and clean sport.