Rathfriland is a market town in County Down, Northern Ireland. It is 8 miles north-east of Newry town centre. In older documents written in English, the town's name was usually spelt Rathfylan or Rathfrilan. It was once the capital of the Magennis family, the Gaelic lords of Iveagh. They built a castle there in the late 16th century. The ruins may still be seen on th…Rathfriland is a market town in County Down, Northern Ireland. It is 8 miles north-east of Newry town centre. In older documents written in English, the town's name was usually spelt Rathfylan or Rathfrilan. It was once the capital of the Magennis family, the Gaelic lords of Iveagh. They built a castle there in the late 16th century. The ruins may still be seen on the hill upon which Rathfriland sits. It was a square building of 3-4 storeys with a stone barrel vault on the ground floor to lessen the risk of fire. The castle was battered down during the Irish Confederate Wars and much of the remainder was carried off by William Hawkins of London, the first Protestant landowner there after the war. The stones were used to build the Town Inn and other houses in the village. In 1760 the Market House, which dominates the main square, was built for the linen market by Miss Theodosia McGill. An old map of 1776 prepared for the Meade Estate shows streets, lanes, tenements and gardens forming the early village.