About ten years ago, a roman road was discovered tracing a path west of Carmarthen. Currently the road is known to reach as far as Wiston where a roman fort was recently found in 2013. This was the first roman fort ever found in Pembrokeshire. Excavation at Whitland as a result of road improvements also confirmed the presence of the road (and witnessed by the writer).
While looking along the route of the roman road on Google maps I recently noticed a rectangular structure very close to the roman road as it passed south of Clunderwen. The image below was taken from Google Maps. The rectangular structure is shown inside the red square (SN12311893). The red line is the rough alignment for the roman road. North is at the top of the image. The houses to the left of the enclosure mark the southern part of Clunderwen with the railway line arcing just at the top of center of the image. The Royal Commission marks this site as a generic ‘ENCLOSURE;DEFENDED ENCLOSURE;HENGE’ but the rectangular dimensions do not match the usual shape for an iron age or post roman site. The site was only recorded in 2011 and even the Royal Commission is unsure how to interpret the site and suggests a possible roman origin. Of more interest is that the distance between Wiston where there is a confirmed roman fort and the one suggested here is between 9 and 10 miles which is a common roman distance between marching camps. The forts that extend from Edinburgh to the north of Scotland are roughly 10 miles apart. The size of the enclosure is roughly 1.3 acres. (94 meters by 54 meters). This is small for a marching camp but not unheard of. For example Knockcross in Cumbria is only 1.5 acres. The Wiston camp is a little bigger at about 130 by 160 meters.
The circumstantial evidence is therefore suggestive that the rectangular enclosure south of clunderwen is in fact another Pembrokeshire roman fort. Only excavation can confirm this hypothesis.