Enclosure, Burgage, Co. Dublin
Co. Dublin |
Enclosures
On a rise in the undulating farmland of Burgage in County Dublin, something is buried that cannot be seen by standing on it.
There are no earthworks to speak of, no visible banks or ditches, nothing to suggest to a passing walker that the ground beneath them holds the ghost of a carefully constructed, triple-ringed enclosure. The site only becomes legible from the air, or through the instruments of geophysical survey.
The existence of the enclosure first came to light through an Ordnance Survey aerial photograph taken in 1992, during flight 8:7660. What the photograph captured were cropmarks, the faint differences in vegetation colour and growth that appear above buried features in dry conditions, where soil disturbed by ancient digging retains moisture differently from the surrounding ground. The marks showed two inner circular ditches sitting one inside the other, themselves enclosed within a broader, roughly sub-circular outer ring. Together, these form what is known as a trivallate enclosure, meaning one defined by three ditches or banks rather than the single ditch more commonly associated with early medieval ringforts. A geophysical survey carried out under Licence 08R0023, undertaken ahead of a proposed road realignment in the area, confirmed the picture in greater detail. The survey recorded two concentric and symmetrical circular responses within an outer response that read as sub-square rather than purely circular. The outer enclosure measures approximately 40 metres in diameter, the middle ring around 27 metres, and the innermost just 12 metres across. Few features were identified within the interior of the enclosures themselves. The report was compiled by Harrison in 2008.
Because nothing of the site is visible at ground level, there is little to see on a visit in any conventional sense. The value here is in knowing it exists, in standing on high ground at Burgage and understanding that the field surface conceals a layered, concentric structure whose original purpose remains unclear. Trivallate enclosures are relatively rare in the Irish archaeological record, and their extra rings are sometimes associated with higher-status sites, though that interpretation remains speculative for this particular location. The surrounding landscape is undulating rather than flat, and the elevated position of the site would have made it conspicuous in its original context, whatever that context was. Anyone with an interest in the archaeology of the greater Dublin region and access to the aerial photography record will find the 1992 OS image the most rewarding way to appreciate what lies beneath.