House Frey of the Crossing is one of the younger houses of the Riverlands. Their main seat is the Twins, a pair of castles that border the green fork of the Trident. Their Lords are called the Lords of the Crossing because their bridge is one of the few that cross that river, and they extract high tolls from anyone wishing to pass. The house sigil is two blue towers united under a bridge on a silver-grey field, representing The Twins. The current head of the house hold is Walder Frey, the second oldest person in all of Westeros, next to Maester Aemon.