Tre'r Ceiri is a hill fort dating back to the British Iron Age. The name is believed to mean "home of the giants", from cewri, plural of cawr, "giant". The settlement is located 450 metres (1,480 ft) above sea level on the slopes of Yr Eifl, a mountain on the north coast of the Llŷn peninsula in Gwynedd, north-western Wales. Evidence suggests the settlement was first built around 200 BC, though most of the archaeological finds date from AD 150–400, placing the site firmly in the Roman period.
Tre'r Ceiri is one of the most spectacular ancient monuments in Wales. The settlement is surrounded by stone walls that are largely intact, and which reach up to 4 metres (13 ft) in some places. Within the walls are ruins of about 150 stone houses, which would have had turf roofs. During Roman times, it may have housed up to 400 people. Historian John Davies suggests that because the settlement is so far above sea level, the huts served as habitations for summer shepherds who also had winter dwellings in the lowlands.
In modern times it was first brought to popular attention by Thomas Pennant in his Tours of Wales. Its location and importance have attracted visitors for years. The hill fort has recently been the site of conservation work and footpath maintenance. An extensive survey was made in 1956.
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