If you happen to be going round a roundabout on the outskirts of Dun Laoghaire and suddenly see a castle, chances are this is it :-) It surprises me every time!
It was built in the 13th century by the cistercian monks, after whom the village of Monkstown is named, to defend against raids by the Wicklow Clans. The ruins consist of an impressive gate-house and the remains of a Keep. Originally the castle would have been an imposing structure with three towers and a large house with six chimneys.
After the Dissolution of the Monasteries in 1539, Sir John Travers was given control of the castle. Until the development of Dun Laoghaire in the late 18th-early 19th centuries, Monkstown Castle would have been considered the chief residence of the area, though thats hard to see now! The estate was broken up in the 18th century and from the 1780's the castle fell into decay and eventually became the ruin you see today.
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