Dyfed Archaeological Trust Historic Environment Record

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Porth Y Rhaw

Primary Reference Number (PRN) : 2721
Trust : Dyfed
Community : Solva
Unitary authority : Pembrokeshire
NGR : SM786242
Site Type (preferred type first) : Iron Age Promontory Fort
Status : Pembrokeshire Coast National Park , Section 43

Summary :
Porth y Rhaw is a multivallate coastal promontory fort much reduced by coastal erosion. The c. 30m high sea cliffs have suffered erosion, so much so that the interior of the fort is now reduced to two small promontories, the eastern one 70m N-S and 25m E-W and the western one 70m SW-NE and 30m NW-SE. These two reduced promontories were undoubtedly once much larger, and probably formed a single block of unknown dimensions. The remains of the interior are relatively level, but immediately to the north of the interior land falls away quite steeply into a shallow valley. The defences make use of this slope, with the inner bank occupying the crest of the valley side, lending a monumental aspect to the whole site. There are four lines of bank and ditch in total. The three inner curving inner ones are close-set and parallel, and c. 120m long. The inner bank rises 4m above the ditch, the second bank is less substantial and rises just 1m above the ditch and the third 1m-2m above the ditch. The outer, fourth, bank is straighter than the others and its course diverges from them at its west end, perhaps indicating a separate phase of construction. Because of the slope the outer bank is almost 20m lower that the inner bank. The entrance has suffered from erosion, but a gap through the inner bank towards its eastern end close to the cliff edge marks its position. Terminals of the second and third banks stop short of the cliff edge - any continuation of these banks, if there were any, has been lost to the sea.

Excavations in 1995-98 revealed the remains of at least eight timber roundhouses, some of which had been rebuilt several times, including one in stone. Radiocarbon dates indicate that occupation started in the early-to-mid Iron Age, and pottery indicates it continued into the 4th century AD.

The site is under rough grass. Apart from the landward side, the whole site is suffering from severe cliff erosion.

K Murphy 4 September 2006 - compiled from several sources

Description :
Porth y Rhaw is a multivallate coastal promontory fort much reduced by coastal erosion. The c. 30m high sea cliffs have suffered erosion, so much so that the interior of the fort is now reduced to two small promontories, the eastern one 70m N-S and 25m E-W and the western one 70m SW-NE and 30m NW-SE. These two reduced promontories were undoubtedly once much larger, and probably formed a single block of unknown dimensions. The remains of the interior are relatively level, but immediately to the north of the interior land falls away quite steeply into a shallow valley. The defences make use of this slope, with the inner bank occupying the crest of the valley side, lending a monumental aspect to the whole site. There are four lies of bank and ditch in total. The three inner curving inner ones are close-set and parallel, and c. 120m long. The inner bank rises 4m above the ditch, the second bank is less substantial and rises just 1m above the ditch and the third 1m-2m above the ditch. The outer, fourth, bank is straighter than the others and its course diverges from them at its west end, perhaps indicating a separate phase of construction. Because of the slope the outer bank is almost 20m lower that the inner bank. The entrance has suffered from erosion, but a gap through the inner bank towards its eastern end close to the cliff edge marks its position. Terminals of the second and third banks stop short of the cliff edge - any continuation of these banks, if there were any, has been lost to the sea.

Excavations in 1995-98 revealed the remains of at least eight timber roundhouses, some of which had been rebuilt several times, including one in stone. Radiocarbon dates indicate occupation started in the early-to-mid Iron Age, and pottery indicates it continued into the 4th century AD.

The site is under rough grass. Apart from the landward side, the whole site is suffering from severe cliff erosion.

K Murphy 4 September 2006 - compiled from several sources

High survey priority. Extensive erosion at western end of the inner defence and where the footpath into the fort crosses the outer bank. Contour survey undertaken. PC 1994

Sources :
, 2721.pdf ( © DAT)
CADW , 2013 , Scheduled Monument Consent
Crane,P & Murphy,K , 2011 , The excavation of a coastal promontory fort at Porth y Rhaw, Solva, Pembrokeshire 1995-98
Enright, C , 2024 , Porth y Rhaw 3D model ( © )
Enright, C , 2024 , Porth y Rhaw Elevation Model ( © )
Hotchin, B. , 2022 , Dyfed Archaeological Trust Races to Uncover Fort's Secrets ( © )
K Murphy, R Ramsey, P Poucher and M Page , 2007 , A SURVEY OF DEFENDED ENCLOSURES IN PEMBROKESHIRE, 2006-07: GAZETTEER OF ORDNANCE SURVEY GRID SQUARES SM72 & SM82
, Tithe Map & Apport,Whitchurch Ph ,
, 1898-9 , Transactions of the Honourable Society of Cymmrodorion ,
Barnwell,EL , 1875 , Archaeologia Cambrensis ,
CADW , 1994 , AM107 ,
Crane,P , 1994 , Dyfed Coastal Promontory Fort Assessment 1993-94 ,
Crane,P , 1996 , Porth y Rhaw coastal promontory fort, Solva, Event PRN 30942 ,
Crane,P , 1997 , Porth Y Rhaw Coastal Promontory Fort Archaeological Excavation Interim Report, Event PRN 30942 ,
Crane,P , 1999 & 2000 , Porth Y Rhaw Coastal Promontory Fort Archaeological Excavations 1995 - 1998 Draft Report, Event PRN 30942 ,
Crossley,DW , 1963 , Bulletin of the Board of Celtic Studies ,
Fenton,R , 1811 , Historical Tour Through Pembrokeshire ,
Grimes,WF , 1932 , Archaeologia Cambrensis ,
Guardian , Racing the sea for fort relics ,
Jones & Freeman , 1856 , Hist.& Ants of St Davids ,
Laws & Owen , 1908 , Pembrokeshire Archaeological Survey ,
MOW , 1961 , AMs England & Wales ,
Meridian Airmaps , 1955 ,
Murphy,K , 2004 , Assessment of Prehistoric Defended Enclosures 2004-5, Report No 2004-100 ,
Murphy,K & Allen,B , 1997 , Coastal Survey 1996-7 - Strumble Head to Ginst Point ,
NT Arch Survey , 1989 , Carn Nwchwn to Nine Wells, Llanunwas - South Wales ,
Nash-Williams,VE , 1933 , Archaeologia Cambrensis ,
OS , 1908 , 1,2500 ,
OS , 1973 ,
PCM , 1980 , Card Index ,
RAF , 1946 ,
RCAHM , 1925 , Pembrokeshire ,
Rees,SE , 1981 , Pembrokeshire SAMs ,
Rigg,J , 1977 , Pembrokeshire Enclosure lists ,
Tarling,DH , 1998 , Archaeomagnetic results from Solva excavtion, Porth y rhaw, Pembrokeshire ,
Western Mail , 1995 , Race with sea over secret of fort ,

Events :
67251 : PORTH Y RHAW CAMP, FIELD OBSERVATION, 1973 (year : 1973)
86013 : PORTH Y RHAW CAMP, FIELD OBSERVATION, 1981 (year : 1981)
90074 : PORTH Y RHAW CAMP, FIELD OBSERVATION, 1989 (year : 1989)
91557 : PORTH Y RHAW CAMP, FIELD OBSERVATION, 1994 (year : 1994)
92362 : PORTH Y RHAW CAMP, FIELD OBSERVATION, 1993 (year : 1993)
92821 : PORTH Y RHAW CAMP, PARTIAL SURVEY, 1994 (year : 1994)
93074 : PORTH Y RHAW CAMP, PARTIAL EXCAVATION, 1995 (year : 1995)
93195 : PORTH Y RHAW CAMP, PARTIAL EXCAVATION, 1996 (year : 1996)
93246 : PORTH Y RHAW CAMP, PARTIAL EXCAVATION, 1997 (year : 1997)
56594 : PREHISTORIC DEFENDED ENCLOSURES: PEMBROKESHIRE (year : 2007)
62160 : Porth y Rhaw Promontory Fort (year : 2006)
120796 : Discovering Our Early Ancestors: Hunter Gatherers in South Pembrokeshire (year : 2020)
118020 : Porth y Rhaw Promontory Fort, Solva, Pembrokeshire (year : 2020)
119223 : Searching for Chariots (year : 2019)
130502 : Porth y Rhaw Camp Footpath Diversion (year : 2023)
130182 : Shoreline Management Plans (year : 2024)

Related records
14798
30942
33470
52108

Compiled date : 01-01-1950


Images :



May 21, 2025, 7:00 am - Html file produced from the Regional Historic Environment Record:
Dyfed Archaeological Trust, The Shire Hall, 8 Carmarthen Street, Llandeilo
Carmarthenshire. SA19 6AF
Tel: 01558 823131, Fax: 01558 823133
Email: info@dyfedarchaeology.org.uk Website:www.dyfedarchaeology.org.uk
Archaeological data, from the Historic Environment Record, supplied by The Dyfed Archaeological Trust in partnership with Local Authorities, Cadw and the partners of ENDEX © DAT, 2025 (and in part © Crown, 2025).