The McGraths seem to have drifted in over the mountains from Thomond, or North Munster, where they supplied hereditary poets to the O'Briens, kings of Thomond, in the first half of the 15th century. They rented lands from the FitzGearlds of Knochmann, later the earls of Desmond, upon which they build their principal seat - Mountain Castle.
The castle itself - or more correctly the tower house - originally consisted of at least three stories. It included all the characteristics one associated with this type of structure including a circular stone staircase, cut stone quoins, batters to prevent undermining, and a cut stone entrance door all surrounded by a enclosing wall. Mountain Castle originally had two cut-stone archway entrances. One of these is still to be seen in the present day dining room. The original outer doorway collapsed during repair work during the seventies but has been reconstructed today at the entrance to the cellar. It originally stood where the door into the kitchen now stands.
Tower houses were introduced into Ireland with the Norman invasion as defensive structures to protect the livestock and belongings of the new Norman Lords. Their design was soon "borrowed" by the native Irish lords who began erecting Tower Houses in large numbers during the 15th century for reasons of their own personal safety and to show off their power and prestige. The advent of the cannon, however, soon made these structures obsolete.
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(1) In Irish 'Caisléan a' tSléibhe'.
(2) According to the latin inscription, the tomb was erected in 1557 by John McGrath and his wife Katherine daughter of Thomas Prendergast, and which also commerated Dónal McGrath