Segontium
| Segontium | |
|---|---|
| Location in Gwynedd | |
| Founded | CE 77 or 78 | 
| Abandoned | CE 4th century | 
| Place in the Roman world | |
| Province | Britannia | 
| Structure | |
| — Stone structure — | |
| Built | 2nd century | 
| — Wood and earth structure — | |
| Built | 1st century | 
| Location | |
| Coordinates | 53°08′14″N 4°15′57″W / 53.1373°N 4.2659°W | 
| Town | Caernarfon | 
| County | Gwynedd | 
| Country | Wales | 
| Reference | |
| UK-OSNG reference | SH485624 | 
| Site notes | |
| Controlled by | Cadw | 
| Website | cadw | 
Segontium (Old Welsh: Cair Segeint) is a Roman fort on the outskirts of Caernarfon in Gwynedd, North Wales.