His four-year old son Loreon became Lord of Casterly Rock, with Lord Jason's widow, Lady Johannaruling in Lord Loreon's minority. Lord Jason Lannister supported King Aegon II Targaryen during the Dance of the Dragons, but was killed in the Battle at the Red Fork. For this, he was named Lord of Casterly Rock and Warden of the West. Following the Field of Fire, King Loren I Lannister bent the knee to King Aegon I Targaryen. House Lannister thus ruled not as Lords of Casterly Rock, but Kings of the Rock until Aegon's Conquest.
The Casterlys were the first Lords of Casterly Rock in the Age of Heroes until Lann the Clever winkled the Casterlys out of the Rock. Lord of Casterly Rock A Wiki of Ice and Fireĩ hours ago 1.