<|im_start|>user
Why did House Targaryen leave Valyria?<|im_end|>
<|im_start|>assistant
Twelve years before Valyria was destroyed by the mysterious "Doom," Aenar Targaryen's daughter, Daenys the Dreamer, had a prophetic vision of Valyria being destroyed, so he decided to take his family to Dragonstone.<|im_end|>
