1896 Summer Olympics: The Olympic marathon is run ending with the victory of Greek athlete Spyridon Louis.

The 1896 Summer Olympics, officially known as the Games of the I Olympiad and commonly known as Athens 1896, were the first international Olympic Games held in modern history. Organised by the International Olympic Committee (IOC), which had been created by French aristocrat Pierre de Coubertin, the event was held in Athens, Greece, from 6 to 15 April 1896.

The marathon is a long-distance foot race with a distance of 42.195 kilometres, usually run as a road race, but the distance can be covered on trail routes. The marathon can be completed by running or with a run/walk strategy. There are also wheelchair divisions. More than 800 marathons are held worldwide each year, with the vast majority of competitors being recreational athletes, as larger marathons can have tens of thousands of participants.

Spyridon Louis, commonly known as Spyros Louis, was a Greek water carrier who won the first modern-day Olympic marathon at the 1896 Summer Olympics. Following his victory, he was celebrated as a national hero.

April 10 is the 100th day of the year in the Gregorian calendar; 265 days remain until the end of the year.