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Caer y Twr Hillfort

Holyhead, Anglesey

Location Guide

Main gateway into fort, from inside Photo by Eric Jones

Looking down on fort layout  Photo by Eric Jones

On top of this mountain you have good all round views, which includes being able to see Ireland on a clear day, a view over Holyhead and around and across the Menia Straits.

Up here in about the 4th century, the Romans built a tower and a small fort, very little of either now survives.

The tower could have been a watch post, or a lighthouse (Pharaos) or both. As a lookout they could see ship movements a long way off, and what was happening throughout the area. As a signalling post they would be able to keep different forts informed of what was happening throughout the region.

A lighthouse or Pharos, would also have provided both a warning of dangerous rocks and been a navigational aid. The walls in some parts are over 10ft thick, and this could have been for defensive purposes or supported a tower of some considerable height.

The Romans never went to Ireland, to our knowledge, and if they did it was not to raid, conquer or stay. They had intentions to add it to their empire, but while preparing for this other demands meant that the forces assembled were needed elsewhere. It may be that this tower was the main navigational aid to get to and back from Ireland and the small 3 sided fort on Holyhead, the Caer Gybi Roman Fort was to be a major part of the supply line to support military operations in Ireland. There may have been a second tower on Carmel Head.

The hillfort, which is situated amongst rocky outcrops, is ideally placed for defence, it is now mostly rubble, but its walls can still be made out, including a large stone rampart on the north and east sides which reaches 3 meters at points. The entrance to the fort was through a rocky gully. The footings of a tower were discovered when the site was excavated, its stones are believed to date from the second century to the fourth century.

Today with the exception of the tower its difficult to see any building outlines, although the perimeter wall is still largely identifiable. The area enclosed is around 17 acres, irregular in shape but around 300 metres across. The walls are still, in places, 10ft high and are 13ft wide suggesting there were walkways along the wall tops. At the entrance the walls turn inwards forming an entrance passage. The tower is around 20ft square.

One of the walls Photo By Eric Jones

Nestled below Caer y Tŵr is a group of several enclosed huts, named Ty Mawr, but also known as Holyhead Mountain Hut Group that also dates from the third to the fourth centuries, some of which still contain the accoutrements of life, such as hearths and shelves.

To visit this is some climb and you will need a map because it is situated at the rear of Holyhead Mountain. It is not on the tourist trail. The views from such a vantage point are well worth the effort, and up there you are most likely to be alone. The down side can be the strong wind and cold, and on some days the mist that rolls in off the sea. The high sea cliffs amplify the rollers that crash against the land and the shrieking cries of the hundreds of seabirds must sound like the tormented wailings of lost souls. With the wind finding every nook and cranny, it can be an experience.

Excavated Roman remains, this is part of the tower

Photo by Eric Jones   Grid ref SH218829

Photo by Eric Jones

Anglesey was invaded twice during the occupation of Britain, little remains to testify to this. Later occupation and garrisoning can be seen in the ruins mentioned above and Caernarfon, on the mainland. There is little evidence to show of the Roman campaigns, one of which must rank as one of the bloodiest operations in the Roman occupation of Britain, whilst remaining an outstanding example of Roman leadership, logistics and planning. Information is available on The Romans initial invasion of Anglesey, and also their return.

It is also thought that a quayside was incorporated into the fort, under the northeast tower. When the Irish were not raiding, did they trade with the locals and the garrison here?

Location: Caer y Twr, Holyhead, Anglesey

Grid Reference: SH218830 Ceremonial County: Anglesey

Map Link: Multimap  Get-a-Map  


Aerial photo: Aerial photo   Multimap

Getting there: From Holyhead follow the minor road past the Breakwater and to the Car Park for Holyhead Breakwater Country Park. Park here, the footpath to the top is rugged, steep and lengthy allow 1-2 hours for the walk.

Access: Open countryside at the summit of Holyhead Mountain. It is also accessible via another path off the Anglesey Coastal Path   between South and North Stack.
Website: CADW  

Other Useful Websites: Wikipedia   BBC article  

Geograph plus 3 other squares that join this corner

Postcode: Telephone:
Opening Times: Open all the time

Charges: Free

Nearby Locations: Holyhead Mountain Hut Group
Other Location Pages: Anglesey Coastal Path 

Other Relevant Pages: Anglesey Attractions     Anglesey Attractions Map

Romans on Anglesey     Romans in Anglesey

Notes: Rugged footwear and suitable clothing and supplies for going up on to a mountain. Be prepared.



Please let us know any other information that we can add to the Grid(s) or page and any errors that you discover. Before making a long trip to any location it is always wise to double check the current information, websites like magazines may be correct at the time the information is written, but things change and it is of course impossible to double check all entries on a regular basis. If you have any good photographs that you feel would improve the illustration of this page then please let us have copies. In referring to this page it is helpful if you quote both the Page Ref and Topic or Section references from the Grid below. To print the planning grid select it then right click and print the selected area.

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By: Keith Park Section: Roman Britain Section Key:
Page Ref: Caer_y_Twr Topic: Roman Britain Last Updated: 07/2010


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