b. Iron Age Promontory fort on the North side of Pwllgwaelod. Defined by a single rampart which runs for 60m across the neck of the promontory, enclosing 0.19ha.
L Osborne, RCAHM

b. Another possible promontory fort might be at SN00303999 about 85m ESE. This is described as a more certain site than the one above with a "defending bank" about 4m long, 2m - 3m wide and 0.5m high. No evidence of habitation within defended area. Source: National Trust Report: John Latham. 1995. Archaeological Survey of Pen Dinas/Dinas Island (unpublished).
John Latham RCAHMW 4 September 2018