House Frey was a vassal of House Tully of the Riverlands and holds its fealty to the Lord of Riverrun. Its current ruler is Lord Raymond Frey. Their castle is known as the Twins, for its two identical keeps on either side of a river linked by a bridge, sometimes called the Stone Bridge. The Twins is one of the primary crossings over the Green Fork of the Trident River, and tolls from bridge crossings have made the Freys quite wealthy.