Caiseal Oengus, prehistoric henge site at Brugh na Bóinne, captured in the early morning spring sunlight

This large henge (embanked enclosure) located beside the River Boyne at Brugh na Bóinne, known on archaeological maps simply as Site P, has been identified tentatively by archaeologist Geraldine Stout as the site referred to in ancient lore as Caisel nOengussa, the Cashel of Oengus.

Aerial photo showing Caiseal Oengus (Site P), the double pond feature and Mound B all along the Boyne.

A description of sixteen sites at the Brug na Bóinne complex is described in the Dindshenchas, a collection of middle Irish legends from around AD900-1200 that poetically describe the "lore of the landmarks". 

It is not known why Oengus/Anghus had a site attributed to him separately to Newgrange (called Tech Mic ind Óc and Sid i mBruig Míc ind Óc in the Dindshenchas poem Brug na Bóinde). It is just one of a number of such embanked enclosures in the area. Perhaps the most famous in the Bend of the Boyne is the Dowth Henge (Site Q) which is one of the largest in Ireland.

Because of its somewhat denuded nature, Site P is best seen when the sun is low in the sky, as demonstrated by this photo taken at 7am this morning on a beautiful spring dawn. Behind the henge to the upper left is a double pond, often described as a figure-of-eight pond, which is thought might be a manmade feature. Caiseal Oengusa and the double pond attract whooper swans, which spend some of their time at these locations when they come to the Boyne Valley from Iceland to spend the winter here. Further off in the distance, behind the double pond, is Mound B, on the flood plain of the Boyne.

North Cross, St. Mary's Abbey, Duleek, Co. Meath

Detail from the North Cross at St. Mary's Abbey in Duleek, Co. Meath. According to Peter Harbison, this is the smallest sandstone High Cross in Ireland. It dates from the 10th century.

http://bit.ly/MI-gallery
from Flickr http://flic.kr/p/FJkBMd

Mystery site - possible monument in heart of the Boyne Valley discovered by artist Richard Moore in 1999

In the summer of 1999, artist Richard Moore asked me if I would like to see a strange site that he had discovered in the heart of the Boyne Valley. It sounded intriguing. "What kind of site?" I asked. He said he didn't know, but that it was located in a place where it wouldn't be easily seen by archaeologists, and he said that as far as he could tell nobody knew about it but him.

The chance of an adventure into the Boyne Valley involving a mysterious unknown site, possibly an ancient monument, was indeed too tempting. So we agreed that the following weekend, we would go out there and I would bring my camera and he would bring his artist's sketch pad. The site is located on interesting terrain - a very steep forest-covered hillside that runs down to the Boyne river. It was difficult to access - even in dry weather. It can only be described as a semicircular man-made feature set into the side of the hill. There were stones forming a distinct semicircle that appeared to create a revetment. It is possible that the area within the semicircle has some sort of flagging stones on its floor - we certainly saw one large flat stone there, and there may have been others.

Richard Moore sketching the mystery site, which is covered by fallen trees. You can just see the Boyne through the trees.

It's all so long ago now that I can't remember a huge amount about it. Without expert knowledge, I can only speculate that it might have either been some sort of holy or sacred well (now dry) or that it might have been some sort of shrine. My opinion, for what it's worth, is that this is a relatively modern construction, but the archaeologists will confirm this one way or the other. One problem on the two occasions we visited was that the feature was partially covered by fallen trees, and apart from the semicircular stone wall, there was little else to be discerned.

We did, of course, report the find to a couple of archaeologists at the time. However, at the time of writing this blog it appears this possible monument is not on the Sites and Monuments Record (SMR). A major reason for that is undoubtedly the fact that the site is in a location that makes it very difficult to access - and it's hardly likely to have been noticed by many people over the years. In fact, on my first visit (we were there twice; on the second occasion I slipped and fell on the wet incline and wounded little more than my pride!), I remember thinking "how the hell did Richard find this place?"

It was located on private land, and as always, Richard had sought the permission of the landowner to access the land. How he ended up on the site of a steep and somewhat treacherous bank in a forest suggests that he has an intrepid spirit that urges him to go beyond the call of normal duty in the search of new things to paint. Below are some more photos of the site:

The site viewed from above.

Richard Moore points to a stone with a stick to add a sense of scale to the site.

A large flat stone which might have been some sort of flag stone on the floor of the feature.

Another view of the site showing how partial subsidence has concealed it.

Find information about any recorded National Monument in Ireland with online map

Above is a short video showing you the basics of the National Monuments Service online interactive map of all known recorded monuments in Ireland. It is an extremely handy and useful resource and one which is relatively easy to use. The video is a short introduction to finding information about a site or monument in your locality.

You can find the map online at this link: http://webgis.archaeology.ie/NationalMonuments/FlexViewer/