Ancient Monuments

History on the Ground

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

Castell y Gaer

A Scheduled Monument in Llangelynin (Llangelynnin), Gwynedd

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: 52.6606 / 52°39'38"N

Longitude: -4.0832 / 4°4'59"W

OS Eastings: 259203

OS Northings: 309026

OS Grid: SH592090

Mapcode National: GBR 8R.5K95

Mapcode Global: WH56Z.7DW4

Entry Name: Castell y Gaer

Scheduled Date:

Source: Cadw

Source ID: 216

Cadw Legacy ID: ME053

Schedule Class: Defence

Category: Hillfort

Period: Prehistoric

County: Gwynedd

Community: Llangelynin (Llangelynnin)

Traditional County: Merionethshire


The monument comprises the remains of a hillfort, which probably dates to the Iron Age period (c. 800 BC - AD 74, the Roman conquest of Wales). Hillforts are usually located on hilltops and surrounded by a single or multiple earthworks of massive proportions. Hillforts must have formed symbols of power within the landscape, while their function may have had as much to do with ostentation and display as defence. Castell-y-Gaer occupies a small rounded spur on the south side of the Afon Gwril. The central enclosure is a rather rectilinear oval, about 60m north-south by 30-44m, defined by scarps above steep natural slopes on the west and north, and enclosed on the south and east by a robbed and disturbed stony bank c.6.0m across. Outside this, still on the south and east, is a further line of defence which takes the form of a second bank outside a ditch on the south, but which peters out to be little more than a platform with a scarped outer edge further north. The southern end of the scarp runs outside the northern end of the bank on the east side, forming the outer portion of a complex entrance which runs a short distance to the south between the two lines of defences before crossing into the inner enclosure. Around the southern arc a further ditch is present outside the second bank.

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.