The marathon was not an event of the ancient Olympic Games. The marathon is a modern event that was first introduced in the Modern Olympic Games of 1896 in Athens, a race from Marathon—northeast of Athens—to the Olympic Stadium, a distance of 42.195 kilometers. The race commemorates the run of Pheidippides, an ancient “day runner” who carried the news of the Persian landing at Marathon of 490 BC to Sparta (a distance of 149 miles) in order to enlist help for the battle. According to the fifth-century BC ancient Greek historian Herodotus, Pheidippides delivered the news to the Spartans the next day. The distance of the modern marathon was standardized as 26 miles and 385 yards or 42.195 kilometers in 1908 when the Olympic Games were held in London. The distance was the exact measurement between Windsor Castle, the start of the race, and the finish line inside White City Stadium.