Ancient Monuments

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Castell Tre-Riffith

A Scheduled Monument in Nevern (Nanhyfer), Pembrokeshire (Sir Benfro)

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Latitude: 52.0697 / 52°4'11"N

Longitude: -4.7727 / 4°46'21"W

OS Eastings: 210054

OS Northings: 244892

OS Grid: SN100448

Mapcode National: GBR CV.CLT4

Mapcode Global: VH2MT.776N

Entry Name: Castell Tre-Riffith

Scheduled Date: 3 August 1950

Source: Cadw

Source ID: 698

Cadw Legacy ID: PE214

Schedule Class: Defence

Category: Promontory Fort - coastal

Period: Prehistoric

County: Pembrokeshire (Sir Benfro)

Community: Nevern (Nanhyfer)

Traditional County: Pembrokeshire


The monument comprises the remains of a defended enclosure, which probably dates to the Iron Age period (c. 800 BC - AD 43). The remains consist of a horse-shoe shaped bank 2m external height, 0.7m high internally extending c 70 m north east to south west across a knoll and turning on cliffs at north and south originally protecting a narrow promontory. The entrance may have been at the south east. Most of the enclosed area, the promontory itself, has eroded away and been lost to the sea and the remainder is suffering severe rotational slumping and original ground surfaces are likely to have almost completely gone.

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, layout, 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.

Source: Cadw

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