The First Marathon: The Legend of Pheidippides — Susan Reynolds

Twenty-five hundred years ago, in ancient Greece, a small band of Greek soldiers faced the mighty Persian army on the plain of Marathon. A runner named Pheidippides ran to neighboring Sparta, one hundred forty miles away, to ask for the Spartans' aid. Afterwards he sped back to the battle, where he helped defeat the enemy. Then the weary runner did his duty yet once more; he ran from Marathon to Athens to deliver the miraculous news of the Greek victory.
 
The legend of brave Pheidippides has inspired the running of marathons worldwide.