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Segontium

Segontium is a Roman auxiliary fort on the edge of Caernarfon in north-west Wales, founded around 77 CE after Agricola's conquest of the Ordovices. It controlled the Menai Strait and access to Anglesey and was garrisoned until the late 4th century, longer than most Roman forts in Wales. Welsh tradition linked it with the usurper Magnus Maximus.

Segontium
Image: JThomas · CC BY-SA 2.0 · Wikimedia Commons

Mentioned in 1 profile

Kingdom of GwyneddFoundation

Mentioned in 1 state history

Ordovices

See also

Cite this entry
APA
The Epoch Institute. (2026). Segontium. In The Epoch Institute Encyclopedia. https://the-epoch-institute.org/encyclopedia/segontium
MLA
“Segontium.” The Epoch Institute Encyclopedia, The Epoch Institute, 2026, https://the-epoch-institute.org/encyclopedia/segontium. Accessed .
Chicago
The Epoch Institute. “Segontium.” The Epoch Institute Encyclopedia. 2026. https://the-epoch-institute.org/encyclopedia/segontium.
Harvard
The Epoch Institute (2026) ‘Segontium’, The Epoch Institute Encyclopedia. Available at: https://the-epoch-institute.org/encyclopedia/segontium (Accessed: ).

Last reviewed October 2026Random entry ↻