Arya led Jayden through the dusty corridors of the ancient castle, her long dark hair swaying behind her as she walked. She had a small leather-bound book in her hand, and she couldn't wait to share its secrets with Jayden.

'Where are we going?' Jayden asked, his curiosity piqued as they turned a corner and entered a dimly-lit room.

'We're going to see the dragons,' Arya replied with a smile, her eyes sparkling with excitement.

Jayden's eyes widened in amazement as he saw the large, leather-bound book sitting on a pedestal in the center of the room. The words 'The Book of Dragons' were etched on the cover in beautiful golden letters.

'This is the book of dragons?' he asked, unable to take his eyes off of it.

Arya nodded and opened the book to a page that showed a beautiful illustration of a large dragon with shimmering silver scales and piercing blue eyes.

'This is the story of house Targaryen, the last great dynasty that ruled the seven kingdoms many centuries ago,' Arya began, her voice taking on a storyteller's tone. 'They were the rulers of the dragons, and their power was unmatched.'

Jayden listened intently as Arya told him the tale of the Targaryens, how they had tamed the dragons and used their power to conquer and rule the seven kingdoms. She spoke of the brave warrior Prince Rhaegar Targaryen, who had been killed in battle, and his sister Princess Daenerys, who had become the mother of dragons.

But the most fascinating part of the story was about a man named Arthur, who had married Princess Rhaenyra Targaryen and became a friend to the Doctor 12 and the current Doctor. Arya explained that the Doctor was a time-traveling alien who had become involved in the Targaryen's struggles.

Jayden was in awe of the bravery and power of the Targaryens and their dragons. But as the story went on, he couldn't help but feel a sense of unease. He had heard rumors of a civil war within the Targaryen family, known as the Dance of the Dragons, which had torn the kingdom apart.

'What happened to Arthur and Princess Rhaenyra after the war?' Jayden asked, his brow furrowing with concern.

Arya's expression turned serious as she closed the book and looked at Jayden. 'Some say Arthur left the seven kingdoms after the civil war. But no one knows for sure. It's a mystery that has puzzled many for centuries.'

Jayden nodded thoughtfully, feeling a sense of sadness for the couple who had become legends in their own right. He knew that he would have to confront the Doctor next time he saw him and ask him about what really happened to Arthur and Princess Rhaenyra.

But for now, he was content to learn more about his new kingdom and the other powerful houses that lived within it. As he left the room with Arya, he couldn't wait to uncover more secrets and unravel the mysteries of the dragons and their rulers.