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Kilronan Castle, previously known as Castle Tenison, is a large country house standing in 40 acres (16 ha) of parkland on the shore of Lough Meelagh in County Roscommon, Republic of Ireland, 2 kilometres (1.2 mi) from the village of Ballyfarnon.
The house, originally constructed c.1820, was considerably expanded in the 1880s to form the current building. The newer part is a two storey, irregular building with a large baronial tower adjacent to the older building. It now functions as a spa hotel.