How pass, you may say, the unpassable? This was his plan: there was a dragon he knew of who if peasants’ prayers are heeded deserved to die, not alone because of the number of maidens he cruelly slew, but because he was bad for the crops; he ravaged the very land and was the bane of a dukedom.
Now Alderic determined to go up against him. So he took horse and spear and pricked till he met the dragon, and the dragon came out against him breathing bitter smoke. And to him Alderic shouted, “Hath foul dragon ever slain true knight?” And well the dragon knew that this had never been, and he hung his head and was silent, for he was glutted with blood. “Then,” said the knight, “if thou would’st ever taste maiden’s blood again thou shalt be my trusty steed, and if not, by this spear there shall befall thee all that the troubadours tell of the dooms of thy breed.”
And the dragon did not open his ravening mouth, nor rush upon the knight, breathing out fire; for well he knew the fate of those that did these things, but he consented to the terms imposed, and swore to the knight to become his trusty steed.
– Lord Dunsany, “The Hoard of the Gibbelins”