House Lannister is one of the Great Houses of the Seven Kingdoms and the principal house of the Westerlands. Its seat is at Casterly Rock. Its coat of arms displays a golden lion rampant on a crimson field, and its words are Hear Me Roar! The Lannisters ruled as Kings of the Rock until House Targaryen invaded Westeros. They are the richest family in the Seven Kingdoms because of the gold mines located on their lands.