NAR SH37SW9

A small cliff girt promontory some 40m deep on the south side of Porth Trecastle or Cable Bay, is cut off by two gullies leading down to the beach. These are thought to follow the line of a defensive ditch, each advancing some 20m from the cliff to a central entrance gap. In the nineteenth century a degraded rampart, 7.8m wide and up to 2.6m high was observed, as well as a small stony mound at the centre of the interior. This last may have been the site of a stone founded roundhouse.
Planned excavation of the fort may have been put off by the arrival of the transatlantic cable en route for the Isle of Man (1866) and the construction of a telegraph cable hut, possibly on the site of the stony mound.
There is now little trace of rampart or mound. The hut has been removed and the cable departed.

Sources: Prichard in Archaeologia Cambrensis 3rd series 15 (1869), 406-7
RCAHM Anglesey Inventory (1937), lxxvi

John Wiles 29.08.07