Lanestown Castle, Newbridge Demesne, Co. Dublin

Lanestown Castle, Newbridge Demesne, Co. Dublin

Just inside the entrance gates of Newbridge House in County Dublin stands a modest three-storey tower house known locally as Lanestown Castle.

Lanestown Castle, Newbridge Demesne, Co. Dublin

Built in a low-lying position rather than the typical defensive hilltop, this medieval structure measures roughly 8 metres square and features the characteristic stepped battlements of a fortified residence. The southwest corner boasts a projecting angle tower containing spiral stairs that wind up through the building, whilst the original entrance was a pointed arched doorway on the north side, now long since blocked up.

The castle’s interior reveals the typical defensive architecture of its era, with a barrel-vaulted ground floor originally lit by a single pointed arch window on the west side. The upper floors, accessed via those southwest spiral stairs, contain chambers with corbelled roofs supported on squinches; a clever bit of medieval engineering that allowed builders to create these curved ceilings. A fireplace at first-floor level connects via machicolation to carry its flue up to the second floor, whilst most windows remain plain except for one elegant pointed arch window with sandstone jambs gracing the second floor’s south wall. On the east side, remnants of what was once a two-storey garderobe structure survive, complete with a mural passage and vaulted ground floor, though the southern portion has suffered considerable damage over the centuries.

Archaeological surveys tell us this tower house once formed part of a much larger complex. A 1776 survey depicts a substantial single-storey residence extending to the east, which remained in use well into the 19th century. When the Cobbe family purchased the surrounding lands from their tenant John Grace around 1820, they demolished these extensive buildings that, according to antiquarian John O’Donovan’s 1830s conversations with Charles Cobbe, had stretched to both the north and east of the castle. Today, signs of the structure’s age are evident in the bulging northeast corner stairwell at first-floor level and the deteriorating masonry at the southeast corner, where substantial subsidence has created a concerning hole in the fabric of this centuries-old survivor.

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Moylan, T.K. 1961 The peninsula of Portrane. Dublin Historical Record 16, 22-3, 37-49. Healy, P. 1975b Third report on monuments and sites of archaeological interest in county Dublin. An Foras Forbartha, Dublin. Healy, P. 1975a Second report on monuments and sites of archaeological interest in county Dublin. An Foras Forbartha Teoranta.
Newbridge Demesne, Co. Dublin
53.48306669, -6.1781305
53.48306669,-6.1781305
Newbridge Demesne 
Tower Houses 

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