Caer Gybi
Holyhead, Anglesey
Caer Gybi is a small Roman fort built at Holyhead in the late Roman period, probably to protect against Irish raiders and to shelter Roman ships. Three of its walls still stand, around St Cybi's church, which was built inside the fort in the 500s.
Read the full story, see it on the map, get directions and find what else is nearby in the free Hidden Britain Atlas map.
- When
- About AD 300s
- Where
- 53.3110, -4.6320
- Group
- Roman Britain
Visiting
Free, in the centre of Holyhead near the port.

The Ledger of Lost Britain
The Romans arrived in AD 43. For most people that is where the history of Britain begins. But by the time the legions landed, people had already been living on these islands for thousands of years. They had hunted, farmed, mined flint, dragged stones across the country, raised a hill by hand, and buried their dead in great tombs. They left no written words. What they left was the ground itself. Every place in this book can be visited, or has been dug up, or is in a museum.
Nearby mysteries
- Ffynnon GwenfaenHoly well · Rhoscolyn, Anglesey · 4 miles away
- Llyn Cerrig BachAncient monument · RAF Valley, Anglesey · 5 miles away
- Bedd BranwenMysterious grave · River Alaw, Anglesey · 9 miles away
- St Dwynwen's WellHoly well · Llanddwyn Island, Anglesey · 15 miles away
- The Royal CharterShipwreck · Moelfre, Anglesey · 16 miles away
- Bryn Celli DduAncient monument · Llanddaniel Fab, Anglesey · 18 miles away