'Brehon's Chair' : Portal Tomb

Grid RefO 158 255
GPSO 15824 25540 (5m)
Longitude6° 15' 49.76" W
Latitude53° 16' 3.22" N
ITM east480366
ITM north584435
Nearest TownTallaght (7 Km)
OS Sheet50
UTM zone29U
UTM x449041
UTM y5761192
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Visit Notes

Saturday, 5th January 2002

This place really surprised me. I had looked for it before but in slightly the wrong place. It now sits in the middle of a play area on a very new housing estate.

My first impressions have been proved wrong. What else, I thought, could have upright stones as mighty as these but a passage tomb, but apparently it was a mighty dolmen known as Brehon's Chair.

Three very tall (3m) stones (the 2 portal stones and 1 door stone) remain and they give off an amazingly overpowering influence. The site lies in a dip or henge about 30m in diameter.

However, apart from its ruinous state that hides what it once must have been, other factors that ruin this site are the nearby houses and the M50 motorway.

Click Thumbnail to View Full Size Image


Thursday, 11th April 2002

The final stop on this short four hour tour of Dublin sites. I wanted to do so many more but other pressures prevented it. Even with this site being next to a motorway and in this sterile estate it is not a bad end to a day.

Sunday, 4th June 2006

While reviewing images for my forthcoming book - Monu-Mental About Prehistoric Dublin (due out in September) - I realised that I just do not have a single good photo of this great monument. Naturally, I had to stop by and take some.

Like this monument

Marked Sites

Random Gazetteer

A Selection of Other Portal Tombs

About Coordinates Displayed

This is an explanation of (and a bit of a disclaimer for) the coordinates I provide.

Where a GPS figure is given this is the master for all other coordinates. According to my Garmin these are quite accurate.

Where there is no GPS figure the 6 figure grid reference is master for the others. This may not be very accurate as it could have come from the OS maps and could have been read by eye. Consequently, all other cordinates are going to have inaccuracies.

The calculation of Longitude and Latitude uses an algorithm that is not 100% accurate. The long/lat figures are used as a basis for calculating the UTM & ITM coordinates. Consequently, UTM & ITM coordinates are slightly out.

UTM is a global coordinate system - Universal Transverse Mercator - that is at the core of the GPS system.

ITM is the new coordinate system - Irish Transverse Mercator - that is more accurate and more GPS friendly than the Irish Grid Reference system. This will be used on the next generation of Irish OS maps.

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