This monument is open and free to visit with no pre-booking required.
Check our opening times and facilities below; please act responsibly and be respectful of the local area during your visit.
Please adhere to Welsh Government social distancing guidelines and coronavirus restrictions at all times and do not attempt to access enclosed spaces.
Access is to outer grounds only and all visitor centres will be closed; there will be no access to refreshments, toilets or other facilities during this time.
This monument is part of Cadw’s Open Doors festival on 18 & 19 September 2021.
Tickets must be reserved in advance for this event — visit our Open Doors event pages to find out more and book tickets.
Roman stronghold that passed into Welsh legend
Established nearly two millennia ago, this strategically-placed fort at the edge of the Roman Empire bustled with life for more than three hundred years.
Segontium was founded by Agricola in AD77 after he brutally suppressed a rebellion by the native tribe known as the Ordovices. Designed to hold a 1,000-strong regiment of auxiliary infantrymen, it was linked by Roman roads to the main legionary bases at Chester and Caerleon.
Thanks to excavated coins we know the Romans stayed until about AD394 – no other fort in Wales was held so long. Segontium not only controlled access to fertile and mineral-rich Anglesey but later helped defend the Welsh coast against Irish pirates.
Long after the final departure of the legions Segontium passed into Welsh legend as Caer aber Seint – ‘the fort at the mouth of the Saint river’ – mentioned in The Dream of Macsen Wledig, one of the ancient tales of the Mabinogion.
The site is open and free to visit between 10am–4pm
Last admission 30 minutes before closing
Closed 24, 25, 26 December and 1 January
Parking is available on the main road adjacent to the monument for a small number of vehicles
Dogs on leads welcome to access ground floor levels of the site.
On-site exhibition within monument.
Site guidebook available to purchase online and in selected visitor centres.
Cadw do not allow drone flying from or over its guardianship sites, except by contractors commissioned for a specific purpose, who satisfy stringent CAA criteria, have the correct insurances and are operating under controlled conditions.
Smoking is not permitted.
This site is available to hire for events, filming and exhibitions.
Telephone 03000 252239
Llanbeblig Rd, Caernarfon LL55 2LN
For contractors, educational visits and deliveries please ring 01286 675072