KILLYLEAGH  , a small seaport and

market town of county Down, Ireland, in the east parliamentary division, on the western shore of Strangford Lough . Pop . (1901), 1410 . Linen manufacture is the principal industry, and agricultural produce is exported . Killyleagh was an important stronghold in early times, and the modern castle preserves the towers of the old building . Sir John de Courcy erected this among many other fortresses in the neighbourhood; it was besieged by Shane O'Neill (1567), destroyed by Monk (1648), and subsequently rebuilt . The town was incorporated by James I., and returned two members to the Irish parliament .