Carn Fadryn, Iron Age hillfort in Llŷn Peninsula, Wales.
Carn Fadryn is a hilltop stronghold in the Llŷn Peninsula featuring a summit at 371 meters (1,217 feet) covering roughly five hectares. The site displays multiple defensive rings and earthen banks that divide the terrain into distinct terraced zones.
Initial construction began around 300 BC when it served as an Early Iron Age settlement. Major reinforcements followed centuries later with additional phases of building around 100 BC and again in 1188 after the death of Owain Gwynedd.
The settlement functioned as a regional stronghold where decisions affecting the surrounding valley were made and defended. Locals in the area still regard it as a landmark tied to their regional identity.
Access starts from the chapel car park via a clearly marked grass track that runs beside stone walls toward the summit. The terrain can be uneven, so sturdy footwear and allowing extra time to explore the earthworks is advisable.
From the highest point visitors can spot Bardsey Island and the Uwchmynydd headland, revealing how far the ancient population could oversee their surroundings. This extended sightline proved strategically valuable for monitoring activity across the peninsula.
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