A Historical Autobiography, as written by D. D. Pendragon.
Forward by Will I Am Shakespeare.
It's all about the rise and fall of the kingdom below from the perspective of the long lived dragon. The king is upset because the dragon appears to be waiting for the kingdom to collapse. Or for something to cause the fall of the kingdom.
What the king doesn't know is the dragon just has writers block since the kingdom has already fallen from its golden age 200 years before. All the remains in the book is the 500 year history of a kingdom. A true treasure to the right librarian.