Despite looking as though it belongs in the Loire Valley, Killyleagh Castle rises close to the south-western shore of Strangford Lough, County Down. The oldest part of the building was constructed in the late 12th century by the Norman knight John de Courcy and this subsequently passed into the control of the O’Neill family. However in the early 17th century Killyleagh was given by James I to a Scottish supporter, James Hamilton whose descendants have lived here ever since: much of its present form dates from c.1666 when the castle was rebuilt by James Hamilton’s grandson, Henry Hamilton, second Earl of Clanbrassil. A complex family dispute towards the end of the 17th century led the castle remaining in possession of the Hamiltons while the bawn wall and gatehouse passed to their relatives the Blackwoods. The two portions of the site were only reunited in 1860 when Frederick Temple Blackwood, future first Marquess of Dufferin and Ava, handed over his share to Archibald Rowan-Hamilton. By then the latter had employed Charles Lanyon to redesign the castle, including the addition of turrets on the two towers.