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Casterly Rock - nicknamed the Rock - is the stronghold of House Lannister and the main castle of The Westerlands. It was built by the extinct House Casterly.
It is the capital of the westerlands, it overlooks the harbor of Lannisport and the Sunset Sea. Nearby strongholds include Kayce and Feastfires to the west, Sarsfield to the north, and Cornfield and Clegane's Keep to the south.
Tyrion Lannister claims his birthright of being the Lord of Casterly Rock from his father, however the later harshly rejects him, telling him he'll never have the Rock, but instead he plans for his marriage to Sansa Stark so he might have Winterfell.