The conversation between human and AI assistant.
[|Human|] Why did House Targaryen leave Valyria?
[|AI|] 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.
[|Human|] 
Why did House Targaryen leave Valyria?