Caer Gybi (fort)
| Caer Gybi | |
|---|---|
| Anglesey, Wales, UK | |
Roman Wall surrounding St Cybi's Church | |
| Location | |
Caer Gybi Location in Anglesey | |
| Coordinates | 53°18′42″N 4°37′58″W / 53.3118°N 4.6328°W |
| Grid reference | SH247826 |
Caer Gybi was a small fortlet and naval base in Roman Wales in the Roman province of Britannia Superior built sometime in the 3rd or 4th century. It stands at the centre of Holyhead in the Welsh county of Anglesey.