Valyria

Valyria, also called Old Valyria, is a ruined city in Essos. It is a long-dead city of wonderment, and was once the capital of a great empire called the Valyrian Freehold. It was destroyed by a cataclysmic event known as the Doom of Valyria a century before Aegon's Landing. It is the ancestral home of House Targaryen, House Celtigar, and House Velaryon.