Site of Rathdown Castle, Rathdown Upper, Co. Wicklow

On a gentle slope overlooking the Irish Sea, the site of Rathdown Castle tells a story of medieval power and centuries of decay.

Site of Rathdown Castle, Rathdown Upper, Co. Wicklow

This 13th-century fortification once belonged to the Fitzdermot clan, descendants of Gaelic nobility who established their manor here in the late 1100s or early 1200s. John Fitzdermot, grandson of a local lord and married to Dervorgilla, daughter of Dermot Mac Murrough and sister-in-law to Strongbow, built his stronghold within what appears to have been a moated enclosure. Today, little remains visible above ground; a decommissioned sewage treatment plant from 1975 and a post-medieval limekiln occupy the southeastern portion of the site, whilst the last standing square tower disappeared in the early 19th century.

Historical accounts paint a picture of gradual destruction. In 1827, visitors could still trace the castle’s ground plan through grass-covered heaps of masonry, with one large square tower featuring walls four feet thick and a round-headed window on its eastern side. By 1838, only fragments remained: 54 feet of the south wall, 26 feet of the east wall, and small portions of the north wall, all standing between five and eight feet high. The Ordnance Survey noted that the castle sat within a considerable rath, or earthen enclosure, with traces of buildings or enclosures to the north that might have been part of a medieval village. Between 1854 and 1856, locals carted away much of the remaining stonework to build the nearby railway bridge and limekiln, accelerating the site’s disappearance.

Archaeological investigations have revealed tantalising glimpses of what lies beneath. Aerial photographs from 1970 show cropmarks of the square enclosure and a possible field system, whilst test trenching in 1994 uncovered medieval agricultural features and the remains of the enclosure ditch. A 2016 geophysical survey detected fragmented responses suggesting heavily plough-damaged archaeological features, including ditched boundaries and field systems. The Fitzdermot legacy ended when Ralph de Pitchford gained custody of the lands in 1233/4 after John Fitzdermot’s death, and by 1297/8 the manor had passed to Albert de Kenley through his marriage to Joan Fitzdermot. Though the castle itself has vanished, the site continues to yield evidence of its medieval past, preserved in the soil if not in stone.

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