Fyrien

"Fyrien was a merchant. He built a castle on the Seas of Meredor as an outpost for trade routes to the east."

- Arthur to Gwen and Merlin

Fyrien was a merchant who built the Castle of Fyrien. He used the castle as a trade outpost and a hideout for his smuggling operation.

History
Fyrien built the Castle of Fyrien to use as an outpost for trade routes to the east. To avoid Camelot's levies, he dug a secret network of tunnels from the castle to the sea to smuggle goods into the kingdom without anyone knowing. Fyrien later abandoned the castle after war broke out between Camelot and Caerleon, causing trade to dry up (The Castle of Fyrien).