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
Athletics at the 1908 Summer Olympics – Men's marathon Athletics at the 1908 Summer Olympics – Men's marathon The men's marathon race of the 1908 Summer Olympics took place in London on 24 July 1908. Johnny Hayes won after Dorando Pietri was disqualified for having received assistance before the finish line. For the first time in an Olympic marathon, the distance was , which would become the standard distance in 1921. 75 competitors entered the race, of whom 55 from 16 nations started, with 27 from 11 nations finishing. At a meeting of the International Olympic Committee in The Hague in May 1907 it was agreed with the British