Euchidas of Plataea, a ultramarathon man mentioned by Plutarch's Aristides:

The magistrates of Greece, therefore, went forthwith and compelled such as had fire to put it out; and Euchidas, a Plataean, promising to fetch fire, with all possible speed, from the altar of the god, went to Delphi, and having sprinkled and purified his body, crowned himself with laurel; and taking the fire from the altar ran back to Plataea, and got back there before sunset, performing in one day a journey of a thousand furlongs; and saluting his fellow-citizens and delivering them the fire, he immediately fell down, and in a short time after expired. But the Plataeans, taking him up, interred him in the temple of Diana Euclia, setting this inscription over him: "Euchidas ran to Delphi and back again in one day."