Every marathon run today covers exactly 26.2 miles, or 42.195 kilometres — a number so specific it seems like it must have been derived from something precise: the exact distance of the ancient run it supposedly commemorates, perhaps, or some careful athletic calculation. It was not. The distance is an accident of royal seating preferences at a single Olympic Games, standardised more than a decade after the fact simply because enough race times had already been recorded at that exact length to make changing it inconvenient.
The Legend Behind the Name
The marathon takes its name from the Battle of Marathon in 490 BCE, and the legend — recorded centuries after the event and almost certainly embellished, if not entirely invented — holds that a messenger named Pheidippides ran from the battlefield at Marathon to Athens, a distance of roughly 25 miles, to announce a Greek victory over the Persians, before collapsing and dying from the exertion. Historians generally treat this specific story with considerable scepticism; the more reliably documented feat attributed to Pheidippides by the historian Herodotus was an entirely different run, from Athens to Sparta and back, covering roughly 150 miles over two days to request military reinforcement — a story with no dramatic collapse, and considerably less mythic appeal.
The First Olympic Marathons
When the modern Olympics were revived in Athens in 1896, a marathon event was created specifically to evoke this legend, and the race distance was approximately 40 kilometres, roughly the actual distance between Marathon and Athens. The 1900 and 1904 Olympic marathons used similarly approximate distances, varying somewhat by host city and course. There was no standardised marathon distance in these early years — each Olympics simply measured a reasonable course between two points and called it a marathon.
The Royal Box Problem
The distance that eventually stuck came from the 1908 London Olympics. The race was originally planned to cover approximately 26 miles, starting at Windsor Castle and finishing at White City Stadium in London. But a specific request altered the final length: the British royal family wanted the race to finish directly in front of the royal viewing box, so that Queen Alexandra and the royal party could watch the finish without needing to move. This required extending the course by an additional 385 yards beyond the stadium entrance, bringing the total distance to exactly 26 miles and 385 yards — 42.195 kilometres.
This specific, royally-adjusted distance was not immediately adopted as a permanent standard. The next several Olympic marathons continued to use varying distances close to, but not identical with, the 1908 figure. It was only in 1921 that the International Amateur Athletic Federation, the sport's governing body at the time, formally standardised the marathon at the 1908 London distance — largely because so many record times had already been set at that specific length that continuing to use it made historical comparison possible, while changing it would have discarded years of record-keeping.
An Accident That Became Sacred
Today, the International Olympic Committee and every major marathon in the world — London, Boston, New York, Berlin, Chicago, Tokyo — uses this exact 26.2-mile distance, treated with a precision and reverence that its origin story does not obviously deserve. Runners train for months and sometimes years to prepare for a distance that exists specifically because a queen did not want to walk further to watch a race finish. There is something fitting about this. The marathon is celebrated as a monument to ancient heroism and human endurance, and its actual defining number comes from twentieth-century royal convenience and a governing body's reluctance to disrupt its own record books. Both stories are, in their own way, true. Only one of them is usually told.