Paarthurnax

An aged Powerful Dragon, Teacher of the Grey Beards and Teacher of the Dragonborn in the ways of the Thu'um or Shout, a powerful way, to mortals, a way to cast unique vocal spells... to other dragons... may as well be arguments in the Dragon language... a wise, powerful dragon who, while ancient, is rather lax with particular mortals who gain his respect or favor... Lives at the throat of the world.