Or better "A Lannister always pays his debts" :) - Lady of House Lannister of Casterly Rock
House Lannister is one of the Great Houses of Westeros, one of its richest and most powerful families and oldest dynasties.
They are also the principal house of the Westerlands and their seat is Casterly Rock.
The Lannisters descend from Andal adventurers who married the daughters of the King of the Rock. The King himself descended from Lann the Clever, a legendary trickster from the Age of Heroes who tricked the Casterlys into giving him Casterly Rock.
The Lannisters reigned as Kings of the Rock until the Targaryen conquest. The Lannisters surrendered and were allowed to remain the paramount lords of the westerlands.
House Personality: most of all powerful and ambitous, greedy - in one words they are the consumers
House sigil: a golden lion on a field of crimson
House words: Hear Me Roar!
-inspired ny G.R.R.Martin's " A Song of Ice and Fire"