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Latitude: 53.3132 / 53°18'47"N
Longitude: -4.6748 / 4°40'29"W
OS Eastings: 221904
OS Northings: 382918
OS Grid: SH219829
Mapcode National: GBR GMTY.CDX
Mapcode Global: WH314.5Z5F
Entry Name: Caer y Twr
Source ID: 2509
Cadw Legacy ID: AN019
Schedule Class: Defence
County: Isle of Anglesey (Ynys Môn)
Community: Holyhead (Caergybi)
Built-Up Area: Holyhead
Traditional County: Anglesey
Caer y Twr comprises an Iron Age hillfort situated on the top of Holyhead Mountain. It is defended by a strong 3 m thick dry-stone wall enclosing some 17 acres. The wall runs round the north and east sides of the fort; the south and west sides are naturally protected by steep cliffs. The wall has not survived so well on the north west side, but on the north and east sides it survives in places to a height of nearly 3m. It has been suggested that a rampart walk was a feature of the wall, but there is less evidence for this now.
On the north east side of the fort is a simple inturned entrance, about 3m wide, which makes use of a natural gully. The interior of the fort is rough and rocky, with no sign of any contemporary habitation sites. However, recent excavation has revealed the possible remains of a Roman signal station on the summit, adjacent to the Ordnance Survey trig point.
There has recently been fairly extensive refurbishment of the footpaths, including repairs, the creation of rough steps, and the piling of stone to discourage use of alternative routes.
This monument is of national importance for its potential to enhance our knowledge of prehistoric domestic life, social organisation and defensive practices. The scheduled area comprises the remains described and an area around them within which related evidence may be expected to survive.
Other nearby scheduled monuments