Segontium Roman Fort
Visitor Notice
New summer guided tours programme launching spring 2025
Segontium Roman Fort will be part of our summer 2025 guided tours programme, offering the opportunity to explore the rich history and culture of this fascinating heritage location with our expert guides.
Look out for updates on our website, social media and newsletter from spring 2025.
Sign up to our newsletter to be the first to find out about tour dates and how to 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.
Opening times & prices
Opening times
| 1st April - 31st March | 10am-4pm |
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Last admission 30 minutes before closing Closed 24, 25, 26 December and 1 January Please note: during extreme weather conditions we may need to close monuments at short notice, please check our social media channels before visiting to ensure the site is open and safe to visit. Facebook @CadwWales | Twitter @cadwwales |
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Visitor information
Car park
Parking is available on the main road adjacent to the monument for a small number of vehicles
Dogs welcome
Dogs on short leads welcome to access ground floor levels of the site.
Venue hire
This site is available to hire for events, filming and exhibitions.
Drone policy
Please read our policy information about flying drones at Cadw monuments: read the guidance
No smoking
Smoking is not permitted.
Directions
Address
Constantine Rd, Caernarfon LL55 2LN
For contractors, educational visits and deliveries please ring 01286 675072
Rydym yn croesawu galwadau’n Gymraeg / We welcome calls in Welsh.
Telephone 03000 252239
Email Cadw@gov.wales
Postcode: LL55 2LN
what3words: ///tiles.listed.edits
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