Prehen House is a large private home near the town of Prehen in Northern Ireland, UK. Built in 1740, the House typically served as the home for the Knox family and was built for Andrew Knox, who was once the M.P for the county of Donegal. The Knox family owned the house for 170 years, the ownership was interrupted during the first world war when the government seized the house for its own protection. Recently however, it has been declared a historic building by the Northern Irish tourist board and the European Heritage board. Prehen house is famously haunted.