White City, London paving outside the building. The Marathon from these London Olympics played an important part in the development of the modern marathon race. In the early years of competitive international sport, the long distance marathon race did not have a standard set distance. The distance run at the first seven Olympics from 1896 to 1920 varied between 40km and 42.75 km. The starting point of the race at the 1908 Olympics was at Windsor Castle creating a distance of 26 miles 385 yards (42.195 km) to the finishing line at White City stadium. In 1921 this was adopted as the standard
Marathon from the start at Windsor Castle to the royal entrance to the White City Stadium, followed by a lap (586 yards 2 feet; 536 m) of the track, finishing in front of the Royal Box. The course was later altered to use a different entrance to the stadium, followed by a partial lap of 385 yards to the same finish. The modern standard distance for the marathon was set by the International Amateur Athletic Federation (IAAF) in May 1921 directly from the length used at the 1908 Summer Olympics in London. An official IAAF marathon course is 42.195 km (42