Lann

Lann the Clever was a legendary trickster of the Age of Heroes. House Lannister claims their descent to him through the female line.

According to legend, Lann the Clever swindled Casterly Rock from its previous rulers, House Casterly, using nothing but his wits.

In the books
In the A Song of Ice and Fire books, Lann the Clever is the founder of House Lannister and a popular character among singers and storytellers. One of the stories narrates how he stole gold from the sun to brighten his hair.