The master of laws for King Aegon I was Triston Massey. When Aegon the Conqueror launched his invasion of Westeros, the Masseys supported him instead of the Storm King, Argilac the Arrogant. Prior to Aegon's Conquest, House Massey was sworn to House Durrandon of Storm's End but had closer ties to House Targaryen of nearby Dragonstone. The Andals eventually made peace and intermarried with the Durrandons.
Less than two years later, however, Josua's daughter married the Andal warlord Togarion Bar Emmon, who expelled Qarlton's men from Stonedance and replaced them with Josua's son. The Masseys returned to the dominion of Storm's End when the Storm King Qarlton II took Stonedance after besieging the castle for a year and slaying King Josua Massey. The Masseys were one of the many houses which historically claimed the mouth of the Blackwater Rush. The Masseys broke away from House Durrandon during the reign of King Durwald the Fat, however. Lord Maldon Massey, a vassal of the Storm King Durran the Ravenfriend, built Stonedance and ruled Massey's Hook. The Masseys are a house of First Men origin.