Marathon world record progression races were first held in 1896, but the distance was not standardized by the International Association of Athletics Federations (IAAF) until 1921. The actual distance for pre-1921 races frequently varied slightly from the present figure of 42.195 km (26 miles 385 yards). In qualifying races for the 1896 Summer Olympics, Greek runners Charilaos Vasilakos (3:18:00) and Ioannis Lavrentis (3:11:27) won the first two modern marathons. On April 10, 1896, Spiridon Louis of Greece won the first Olympic marathon in Athens, Greece in a time of 2:58:50; however, the distance for the event was reported to be only 40,000 meters. Three
Athletics at the 1908 Summer Olympics – Men's marathon at the Olympic Stadium, the Great White City Stadium in Shepherd's Bush in London. The Polytechnic Harriers were also tasked with organising a Marathon Trial Race, to be run along most of the Olympic Marathon route. By April 1908, a revised map of the course of the Trial Race was published, also showing the intended course of the Olympic Marathon. It had by this time been decided to fix the Olympic Marathon distance at "about 26 miles" to the stadium, plus a lap of the track (), using the Royal Entrance as the marathon tunnel, and finishing at the normal