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The position of this fort, on a low sea-side cliff, and the suggestion of an enclosed quay and the similarity to Roman coastal forts have given rise to its interpretation as a late Roman fort.
It possibly dates back to the third century and used as a coastal defence, against Irish raiders. It may have been linked with the late Roman watchtower on Caer Y Twr on Holyhead's 750 ft Mountain, called Mynydd Y Twr.
Caer Gybi is a rectangular fort about 246ft (75m) by 148ft (45m). The curtain wall with dressed stones placed in a herringbone pattern, stands to a height of 13ft (4m) and 5ft (1.5m) thick. The wall us extreemly well preserved. Originally, there were four corner towers but the south-west tower is now masked by more modern buildings. The north-east tower is about 26ft (7.9m) in height, although the top is medieval.
The archway in the northern part of the fort is modern. The wall on the inside and to the right is again well preserved. On the east side, overlooking the port you can see the high platform on which the fort was built and you can see where the wall projects slightly just beyond the north-east tower. It is thought that because of this, there may have been a quay to this side of the fort.
To the south of the fort, is the wall which has a double archway, which may mark the position of the south gate. Traditionally the fort is the site of a Christian Monastic foundation granted by King Maelgwyn of Gwynedd to St. Cybi.
The present Parish Church built between 13th to 16th centuries stands on the site of the church built by St. Cybi within the walls of the fort. It is a good perpendicular building with an enriched porch. The original ediface has been enlarged and renovated from time to time. The chancel is the earliest part of the structure and was originally part of the 13th Century Church cruciform in shape, with
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