This article relies largely or entirely on a single source. (November 2011)
The building was a 19th-century castle. Originally built by the 2nd Lord Rossmore in 1827 in the Gothic style, it was extended in 1858. Lord Rossmore and the Shirleys of Lough Fea had competed for many years for the largest room in County Monaghan with the result that the drawing room at Rossmore was extended five times.
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