The "Prince of Dragonstone" is a title traditionally used by the heir apparent to the ruling monarch of the Seven Kingdoms. The title was created after Aegon I Targaryen unified the Seven Kingdoms in the War of Conquest. While kings of the Targaryen dynasty ruled from the Iron Throne in King's Landing, the heir to the throne would traditionally rule over the ancestral Targaryen lands: the volcanic island of Dragonstone, located on the far side of Blackwater Bay from King's Landing itself.