The Percies regained ownership of the Prudhoe estates in 1440, after a prolonged legal battle. However, Henry Percy, 3rd Earl of Northumberland fought on the Lancastrian side in the Wars of the Roses and was killed at the Battle of Towton in 1461. In 1462 Edward IV granted Prudhoe to his younger brother George, Duke of Clarence. The latter only possessed the castle briefly before the king granted it to Lord Montague.