McIlhenny was the last private owner of the Glenveagh Estate, which covers a large, remote region of County Donegal, part of the Province of Ulster in Ireland. He bought the 170 square kilometre estate in 1938, having rented during the summers since 1933, and used it regularly as a part-time residence until 1982.
McIlhenny was the last private owner of the Glenveagh Estate, which is a large, remote area in County Donegal, part of Ulster in Ireland. He acquired the estate in 1938 after renting it for summers since 1933 and used it as a secondary residence until 1982.