Ancient Monuments

History on the Ground

This site is entirely user-supported. See how you can help.

Portal dolmen known as 'The Three Brothers of Grugith'

A Scheduled Monument in St. Keverne, Cornwall

We don't have any photos of this monument yet. Why don't you be the first to send us one?

Upload Photo »

Approximate Location Map
Large Map »

If Google Street View is available, the image is from the best available vantage point looking, if possible, towards the location of the monument. Where it is not available, the satellite view is shown instead.


Latitude: 50.0361 / 50°2'9"N

Longitude: -5.1271 / 5°7'37"W

OS Eastings: 176167.688384

OS Northings: 19788.020715

OS Grid: SW761197

Mapcode National: GBR ZB.DSFC

Mapcode Global: FRA 084X.BDW

Entry Name: Portal dolmen known as 'The Three Brothers of Grugith'

Scheduled Date: 10 August 1923

Source: Historic England

Source ID: 1006746

English Heritage Legacy ID: CO 4

County: Cornwall

Civil Parish: St. Keverne

Traditional County: Cornwall

Lieutenancy Area (Ceremonial County): Cornwall

Church of England Parish: St Keverne

Church of England Diocese: Truro


The monument includes a portal dolmen called 'The Three Brothers of Grugith' or 'Grugwith' situated close to the summit of a prominent hill overlooking Goonhilly Downs. The dolmen survives as two upright parallel orthostats supporting a large capstone enclosing an area measuring approximately 4m long, 2m wide and 1m high. Shallow depressions on the surface of the capstone have been interpreted as either cup-marks (early prehistoric rock art) or natural features. The chamber was excavated by Borlase in 1872, and he discovered a pit approximately 1m deep and a single flint flake. There is debate as to whether one of the upright stones is natural. There is little surface evidence for an enclosing mound.

Sources: HER:-
PastScape Monument No:-426455

Source: Historic England

Reasons for Scheduling

Portal dolmens are funerary and ceremonial monuments of the Early and Middle Neolithic period, the dated examples showing construction in the period 3500- 2600 BC. As burial monuments of Britain's early farming communities, they are among the oldest visible field monuments to survive in the present landscape. Where sufficiently well-preserved, they comprise a small closed rectangular chamber built from large stone slabs, with free-standing stones flanking the frontal slab of the chamber. A capstone, often massive, covers the chamber, and some examples show traces of a low cairn or platform around the chamber. Some sites have traces of a kerb around the cairn and certain sites show a forecourt area, edged by a facade of upright stones in a few examples. Little is yet known about the form of the primary burial rites. At the few excavated sites, pits and postholes have been recorded within and in front of the chamber, containing charcoal and cremated bone; some chamber contents of soil and stones may be original blocking deposits. Many portal dolmens were re-used for urned cremations, especially during the Middle Bronze Age. Only about 20 portal dolmens are known nationally, concentrated in west Penwith, Cornwall, and in the north-west Oxfordshire Cotswolds, with a scatter between these. As one of the few surviving field monument types of the Neolithic period, and due to their rarity, considerable age and longevity of construction and use, all
portal dolmens are considered to be nationally important. Despite partial early excavation and the limited preservation of the enclosing mound, the portal dolmen known as 'The Three Brothers of Grugith' survives comparatively well, especially considering its great age and fairly prominent location. It is one of a nationally rare group of monuments. It will contain archaeological and environmental evidence relating to its construction, longevity, funerary practices, ritual and social significance and its overall landscape context

Source: Historic England

Other nearby scheduled monuments is an independent online resource and is not associated with any government department. All government data published here is used under licence. Please do not contact for any queries related to any individual ancient or schedued monument, planning permission related to scheduled monuments or the scheduling process itself. is a Good Stuff website.