As its name indicates, Threecastles in County Wicklow was once the site of three fortified buildings, only one of which still survives, at least in part. While the history of this tower house is unclear, it is believed to have been constructed in the early 16th century when this part of the country came under the control of Gerald FitzGerald, eighth Earl of Kildare who was Lord Deputy of Ireland in the years until his death in 1513. Faced in local granite, the battlemented upper section of the three-storey building is missing, as is a substantial portion which once extended to the west.

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