Ancient Monuments

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Castell Heinif

A Scheduled Monument in St. David's and the Cathedral Close (Tŷddewi a Chlos y Gadeirlan), Pembrokeshire (Sir Benfro)

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Latitude: 51.8742 / 51°52'26"N

Longitude: -5.3081 / 5°18'29"W

OS Eastings: 172380

OS Northings: 224683

OS Grid: SM723246

Mapcode National: GBR C4.S01Q

Mapcode Global: VH0TK.Y553

Entry Name: Castell Heinif

Scheduled Date: 8 October 1952

Source: Cadw

Source ID: 153

Cadw Legacy ID: PE295

Schedule Class: Defence

Category: Promontory Fort - coastal

Period: Prehistoric

County: Pembrokeshire (Sir Benfro)

Community: St. David's and the Cathedral Close (Tŷddewi a Chlos y Gadeirlan)

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 enclosure is located on a narrow coastal promontory above sea cliffs 25m high under which lies Ogof Mary a natural arch. The narrow neck by which joins to the mainland on the east is defended by a two curving ramparts c 115m long. The inner bank measures about 2.5m high above the interior and 2.3m above the bottom of the ditch and held a stone revetment. The outer bank is of similar proportions. On the south east side a length of bank of lesser size lies for c 30m between the two main banks where it may have been related to arrangements for an entrance.

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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