Casterly Rock
Casterly Rock is the ancestral stronghold of House Lannister. It’s located on the Western coast of Westeros on a rocky promontory overlooking the Sunset Sea. It overlooks the major city of Lannisport. A major goldmine is located under Casterly Rock. It is one of the most productive in the realm and provides House Lannister with their wealth.
According to tradition, the castle was originally held by the House Casterly, the old Kings of the Rock. They were hoodwinked into giving the Rock to Lann the Clever, a legendary trickster and ancestor of House Lannister, thousands of years ago, during the Age of Heroes.
The castle was briefly controlled by the Unsullied forces of House Targaryen, whose victory over the Lannister forces was Pyrrhic