Board Thread:Off-Topic Discussion/@comment-26070146-20130824152043/@comment-5674726-20130829211655

Fimber wrote: However, we will never know whether or not Uther just claimed to have defeated the dragons. Personally, I doubt that it was a lie since we never saw another dragon up until Aithusa was hatched.

Maybe they were already a dying race, a hairbreadth from extinction, with Kilgharrah as one of very few healthy ones - if not the only healthy one - while Aithusa was the last egg.