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Latitude: 51.7304 / 51°43'49"N
Longitude: -5.0351 / 5°2'6"W
OS Eastings: 190503
OS Northings: 207886
OS Grid: SM905078
Mapcode National: GBR G5.W5SS
Mapcode Global: VH1RR.PR0T
Entry Name: Thornton Rath
Scheduled Date: 7 June 1950
Source ID: 470
Cadw Legacy ID: PE187
Schedule Class: Defence
Category: Promontory Fort - inland
County: Pembrokeshire (Sir Benfro)
Community: Tiers Cross
Traditional County: Pembrokeshire
The monument comprises the remains of a defended enclosure, which probably dates to the Iron Age period (c. 800 BC - AD 74, the Roman conquest of Wales). Inland promontory forts are usually located on a ridge or spur with steep slopes on 2 or 3 sides, and artificial ramparts on the level approaches. Alternatively they may have been constructed on a promontory above the confluence of two rivers, or in the bend of a meander. Thornton Rath is defended by a double bank and ditch. The inner bank rises 15ft above the bottom of the inner ditch. On the east the ground falls steeply and there is no bank or ditch. At the north-east corner the defences have been flattered to make an entrance to the interior.
The monument is of national importance for its potential to enhance our knowledge of later prehistoric defensive organisation and settlement. The site forms an important element within the wider later prehistoric context and within the surrounding landscape. The site is well preserved and retains considerable archaeological potential. There is a strong probability of the presence of evidence relating to chronology, building techniques and functional detail. The scheduled area comprises the remains described and areas around them within which related evidence may be expected to survive.