|The title of this article is conjecture based on information revealed in the A Song of Ice and Fire novels or related material and may be subject to change.
- "Someone found enough gold in that cave to buy whatever truth he wanted, along with a castle that he'd name after his new family: Casterly Rock."
- ―Jaime Lannister
According to legend, a huntsman tracked a lion that was terrorizing his village to a cave on the coast of the Westerlands. He killed both the lion and its mate, but spared the cubs. This pleased the Old Gods, and they sent a beam of sunlight deep into the cave, turning the stone walls to gold. He began mining the gold, and built a fort at the top of the mountain at which the gold mine was buried under. This fort would become a castle, and it would be known as Casterly Rock - named in honor of the huntsman's new house, House Casterly. With his new wealth and power, he ruled the Westerlands from his new home, and so did his descendants for hundreds of years until the castle was swindled from them by Lann the Clever.
In the books
In The World of Ice & Fire, Corlos's story is the same. His father was Caster, the eponym of House Casterly.