Dunbeg Fort: An Iron Age Promontory Fort in Ireland
Site at a Glance
- Rating
- 2.9
- Popularity
- Low
- Country
- Ireland
- Primary era
- Iron Age
- Eras represented
- Iron Age, Medieval
- Civilizations
- Unclassified
- Site type
- Military
- Remains
- Fort
On this page14 sections
History
Dunbeg Fort is an Iron Age promontory fort in Ireland, near Ventry on the Dingle Peninsula in County Kerry. It occupies a projecting headland overlooking Dingle Bay and the Atlantic Ocean, and continued in use into the medieval period. The Iron Age in Ireland is generally associated with the first millennium BC, but the fort’s exact construction date remains uncertain.
Iron Age Origins
A piece of wood from a ditch partly beneath the stone wall was dated to around 580 BC, showing that the wall is no older than that date. Another piece of wood, taken from a deposit overlying the base of a retaining wall, was dated to around AD 800. This indicates that the wall had been built before then, placing its construction between those two chronological limits without establishing a precise foundation date.
The fort’s form has been compared with Iron Age blockhouse forts in Scotland, including Crosskirk in Caithness and Clickimin, Ness of Burgi, and Huxter in Shetland. Within Dunbeg, the occupation remains include drystone clocháns, or beehive huts made from stone courses that curve inward to form roofs. The clochán inside the fort was built in the tenth century AD. A nearby group of clocháns associated with the Fahan settlement may date to around 1000 BC.
Later Recording and Coastal Loss
George Victor Du Noyer, a nineteenth-century Irish artist and antiquarian, recorded Dunbeg Fort in 1858. At that time, the defensive wall, entrance, internal rooms, and traces of several clocháns could still be observed. R. A. S. Macalister, an Irish archaeologist known for his work on prehistoric and early medieval monuments, described the entrance lintel in 1898 as the most notable in Ireland.
Coastal erosion has progressively reduced the fort as the cliffs have retreated. In January 2014, storm damage caused much of the western wall to fall into the sea, leading to investigation by the Office of Public Works and the National Monuments Service. Further storms in December 2017 and January 2018 were followed by a landslip that destroyed substantial parts of the site. The exposed position leaves Dunbeg vulnerable to continuing weather events and climate change, and the Office of Public Works has undertaken measures intended to protect its architectural, archaeological, and natural features. Dunbeg Fort is an Irish national monument under reference number 177.
Remains
Dunbeg Fort occupies a rocky promontory south of Slea Head, with cliffs forming part of its natural defense. A substantial dry-stone enclosure wall once cut off the triangular headland from the mainland, while earthworks strengthened the landward approach. The cliffs have eroded since the fort was built, and substantial portions of the site have been lost to the sea.
Landward Defenses
Earthworks
Four parallel ditches lie in front of the defensive wall, separated by three mounds made from clay and gravel. These earthworks may have preceded the stone wall, which could later have reinforced the defenses. A pathway approached the entrance through the outer defenses and may originally have crossed the earthworks by stone passages with flagged roofs.
Defensive Wall and Entrance
The defensive wall was approximately 200 feet, or 61 metres, long in Du Noyer’s description and measured about 15 to 25 feet, or 4.6 to 7.6 metres, across. Surviving sections reach roughly 6 metres in thickness and 3 metres in height. The original wall was about 8 to 11 feet, or 2.4 to 3.4 metres, thick, and was later enlarged on the landward side to as much as 22 feet, or 6.7 metres, near the entrance. It was built without mortar, using carefully placed stones.
The entrance passage lies near the midpoint of the wall. Its 7-foot, or 2.1-metre, lintel is a horizontal stone spanning the doorway. The passage is about 2 feet, or 0.61 metres, wide at the top and 3 feet, or 0.91 metres, wide at the base, widening to approximately 8 feet, or 2.4 metres, inside the fort. Its ceiling is arched. Lateral holes held a wooden beam for a door, and a low-level opening known as a doghole formed part of the entrance arrangement. Erosion in December 2017 and early 2018 caused substantial damage to the doorway.
Wall Chambers and Cliff Defenses
Internal Wall Rooms
A rectangular room measuring approximately 10 by 6 feet, or 3.0 by 1.8 metres, is built into the wall on the right side of the entrance. It is reached from the passage through a low square opening and contains a broad bench-like seat opposite the opening. A similar room lies on the left side of the passage and is entered from within the fort through another low square opening.
Covered Passages and Parapet
Long, narrow covered passages run within the wall on both sides of the entrance. Their apparent inaccessibility leaves their purpose uncertain. The inner face of the wall slopes inward in steps, presumably providing access to a parapet, the protective raised edge along the top of a fortification.
Cliff and Boundary Walls
A wall formerly ran along the western cliff, which rises approximately 90 feet, or 27 metres, above sea level. Two parallel walls extended from the fort toward the slopes of Mount Eagle, separating the land around the Fahan settlement from land to the east.
Internal Structures
Drystone Clocháns
Traces of several drystone clocháns survive inside the fort, although their original arrangement is no longer clear. One structure had a rectangular interior and a circular exterior. The clochán built in the tenth century AD represents the fort’s continued occupation during the medieval period.
Souterrain
A souterrain, meaning a subterranean or partly underground passage or chamber, extends for approximately 16.5 metres from the interior toward the outer wall. It is roofed with large stone slabs and forms part of the fort’s surviving underground remains.
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