Dragonstone is an island that guards the entrance to Blackwater Bay and the sea approaches to King's Landing, off the east coast of Westeros. It is also the name of the castle that stands upon it. It is the ancestral home of House Targaryen. At the time, it is held by the remnants of House Targaryan . The Chamber of the Painted Table is inside the castle. The castle was built using Valyrian stonemasonry techniques, long since lost.