House Mudd of Oldstones was the last of the First Men dynasties to rule the rivers between the green hills and the Trident, succeeding the line of the Fishers and standing for a thousand years as Kings of the Rivers and the Hills. Their castle rose upon a high stony bluff above the Blue Fork, the strongest hold in Westeros at the day of its raising, and from those walls the muddy crown of emerald and gold passed from father to son until the Andals came across the narrow sea with their iron and their seven-pointed stars.
Greatest of the Mudd kings was Tristifer IV, whom singers name the Hammer of Justice. He fought one hundred battles against the invaders and won ninety-nine of them — against river lords who broke faith, against the children of the forest in their last twilight, and against the Andal warbands that crept inland year by year. In the hundredth and last battle seven Andal kings banded together against him, and the greatest of them, Armistead Vance, struck him down upon the bank of his own river. His son Tristifer V was not the equal of his father; under him the riverlands fell to the Andal kings piece by piece, and with him the line of the Mudds, the river crown, and the rule of the First Men over the Trident together passed out of the world. Oldstones stands ruined to this day above the Blue Fork, and the tomb of King Tristifer the Hammer is the only Mudd monument the rains have not yet washed away.