There is also a hut circle at the base of the fort, below the hilltop on its western side, where the approach to the fort itself is at its least naturally steep. Coflien say:
The first hut circle is an ovoid in shape, measuring 11m in diameter, the walls are constructed of medium-sized stones, and the walls remain as a bank measuring up to 1.5m wide by 0.6m high. The southern half of the bank is now turf covered, whilst the northern half survives as an exposed stone bank. The construction of the wall is evident on the east side as double thickness kerbing walls with stone infill. The site was probably later reused as a stock shelter.
Sited at the terminus of the north-eastern ridge of Moel Eilio, overlooking Llanberis.... not to mention the much newer (ha!) native Welsh fortress of Dobadarn... this small enclosure has not had to suffer my boots as yet, although I have unwittingly walked right by. Nevertheless Coflein know the score:
'On the summit of an isolated hill surrounded by the 90m contour and overlooking the village of Llanberis, are the remains of an oval camp protected by a single stone vallum, measuring about 90m from west-south-west to east-north-east, and 30m across at its maximum width. The position is one of remarkable strength, for along the whole of the northern side the cliffs are 60m high and very precipitous. Yet it is on this side that the only stretch of well-preserved walling is to be found. The external rampart masonry consists of large facing stones each measuring up to 1m wide by 1m high, with smaller packing stones set behind them. The site is very poorly preserved at ground level.'
Source: Caernarvonshire Inventory Volume II, 169 (1136). RCAHMW, June 2009