In November 866 AD a large army of Danish Vikings, called the "Great Heathen Army", captured York, unopposed due to conflict in the Kingdom of Northumbria. The next year they held the city when the Northumbrians tried to retake it; the army left the same year putting a local puppet king in charge of York and the area around York they controlled. The army returned in 875 and its leader Halfdan took control of York. From York, Viking kings ruled an area, known to historians as "The Kingdom of Jorvik", with Danes migrating and settling in large numbers in the Kingdom and in York. In York the Old Norse placename "Konungsgurtha", Kings Court, recorded in the late 14th century in relation to an area immediately outside the site of the "porta principalis sinistra", the west gatehouse of the Roman encampment, perpetuated today as King's Square, perhaps indicates a Viking royal palace site based on the remains of the east gate of the Roman fortress. In 954 the last Viking king, Eric Bloodaxe, was expelled and his kingdom was incorporated in the newly consolidated Anglo-Saxon state.