Ancient Monuments

History on the Ground

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


A Scheduled Monument in Llanrhidian Higher (Llanrhidian Uchaf), Swansea (Abertawe)

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: 51.6329 / 51°37'58"N

Longitude: -4.096 / 4°5'45"W

OS Eastings: 255030

OS Northings: 194760

OS Grid: SS550947

Mapcode National: GBR GV.D1N7

Mapcode Global: VH4K6.Y7F1

Entry Name: Gron-Gaer

Scheduled Date:

Source: Cadw

Source ID: 3635

Cadw Legacy ID: GM197

Schedule Class: Monument

Category: Enclosure

Period: Prehistoric

County: Swansea (Abertawe)

Community: Llanrhidian Higher (Llanrhidian Uchaf)

Built-Up Area: Pen-clawdd

Traditional County: Glamorgan


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). Defended enclosures are usually located on high ground and are protected by artificial ramparts consisting of banks and ditches.

Gron Gaer stands at about 70m above OD about a kilometre south of Pen-clawdd on a spur defended naturally on the west by a sharp fall into a ravine, and to a less extent on the north by a re-entrant valley. Thre is no defence on the south, where the ground falls gently, but the east side, where the ground rises very gently, is defended by a bank running in a curve slightly convex to the east and traceable for 37m; the area enclosed is about 0.1ha. The bank is 10m wide at the base, nearly 2m high internally and 1m externally. There is a suggestion of a turn towards the west at its north end. The bank has a curiously isolated air and the defences appear to be unfinished.

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.

Source: Cadw

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.