- The inspiration for the feat is the popular, albeit historically inaccurate myth of Pheidippides, the Greek "hemerodromos" (military runner), who is said to have run from the battlefield of Marathon to Athens in 490 BC to announce victory over the Persians, only to die of exhaustion afterwards.
- The Kenyan had taken inspiration from a run he made in May 2017 when he clocked 2hrs 25secs on a special track at the Monza National Autodrome in Italy.
First run in Athens in 1896 in just under three hours, the marathon has become the classic challenge for thousands of runners around the world every year.
As Kenyan Olympic champion Eliud Kipchoge attempts the previously unthinkable feat of breaking the two-hour barrier Saturday, AFP looks back at other marathon milestones.
The inspiration for the feat is the popular, albeit historically inaccurate myth of Pheidippides, the Greek "hemerodromos" (military runner), who is said to have run from the battlefield of Marathon to Athens in 490 BC to announce victory over the Persians, only to die of exhaustion afterwards.
In spite of the fact the story was invented by the satirist Lucian in the second century AD - around 700 years after the Battle of Marathon - Baron de Coubertin, father of the modern Olympics, championed the romance and bravery of the tale to ignite interest in the 1896 Olympics.
Seventeen runners took part in the first Olympic marathon at the inaugural Games in 1896, starting in Marathon and ending in the Olympic stadium in Athens, a distance of just under 40km - a little short of today's standard 42.195-kilometres (26 miles 385 yards).
The first to cross the finish line was a shepherd and former soldier, Spyridon Louis, who became a national hero when he completed the race in two hours and 58 minutes despite stopping to quaff a glass of wine halfway through.
Third-place finisher Spyridon Belokas was disqualified after it was discovered that he had completed part of the course in a carriage.
A Greek woman, Stamata Revithi, was denied entry to the race although contemporary reports claim that she successfully completed the course the day after.
Twelve years later at the London Games, tiny Italian Dorando Pietri - he stood just 1.59 metres - entered London's White City stadium dehydrated, in agony and drunk with fatigue as he closed in on victory.
He was helped by spectators and half-carried over the line, finishing first in a time of 2hrs 54min 46sec and then collapsing unconscious.
Pietri was disqualified for being helped and the race awarded to Johnny Hayes, who finished 32secs behind, after an appeal from the American team.
Moved by his exploit, Queen Alexandra presented Pietri with a gilded silver cup and he became an international celebrity.
That race, which started in Windsor and ended at White City, was the first time the marathon - previously around 40km-long - was run at 42.195km, with an extra 385 yards (352 metres) added to set the finish line in front of the royal box.
This would become fixed as its official distance and Hayes' time of 2hrs 55mins 18secs was the first official world record.
Ethiopia's Abebe Bikila became an international sporting icon at the 1960 Rome Olympics, running barefoot to victory on his way to setting a new world record of 2hrs 15min 16sec and making history as the first African to win the Olympic marathon.