

The first known King of the Rock was Loreon I Lannister, although Lann the Clever has posthumously been called by the same title. Meanwhile, the Lannisters of Casterly Rock grew to become Kings of the Rock. Īccording to a semi-canon source, members of lesser branches of the family left Casterly Rock and developed a nearby village into the city of Lannisport, forming House Lannister of Lannisport.

They claim descent from Lann the Clever, the legendary figure who tricked the Casterlys from Casterly Rock. The Lannisters suddenly appear as First Men in historical records of the Age of Heroes, ruling large portions of the westerlands from Casterly Rock just as the Casterlys vanish from the chronicles. Tywin's youngest child is Tyrion, a dwarf. The current Lord of Casterly Rock is Tywin Lannister, whose daughter Cersei is the queen of King Robert I Baratheon, while her twin, Ser Jaime, is a knight of Robert's Kingsguard. King Loren I Lannister's surrender to Aegon the Conqueror allowed the Lannisters to remain the liege lords of the westerlands. Later marrying Andals, the Lannisters reigned as Kings of the Rock until the Targaryen conquest, when they were defeated at the Field of Fire. Through the female line the Lannisters boast of descent from Lann the Clever, the legendary trickster of the Age of Heroes who tricked the members of House Casterly into giving him Casterly Rock during the era of the First Men. Their gold mines have made the Lannisters the wealthiest of the Great Houses. Their official motto is "Hear Me Roar!" However, their unofficial motto, equally well known, is "A Lannister always pays his debts." The Warden of the West is a Lannister by tradition. Their sigil is a golden lion on a field of crimson. Their seat is Casterly Rock, though another branch exists in nearby Lannisport. House Lannister of Casterly Rock is one of the Great Houses of Seven Kingdoms, and the principal house of the westerlands.
