Castle Island
| Estate(s) | |
|---|---|
| Townland | Castle Island |
| Civil Parish | Ardcarn |
| PLU | Boyle |
| DED | Rockingham 36 |
| County | Roscommon |
| Barony | Boyle |
| Description | Also known locally as the Rock of Lough Key, at the time of Griffith's Valuation Viscount Lorton's estate owned a house on Castle Island valued at £14. The original building on the island was a medieval stronghold of the McDermott family to which additions were made in the early 19th century. Renovation work was taking place on these buildings in 2007. |
