Being only 0.5 acres in area, and built on a small prominent rock, this fort did not have much room for a settlement, but due to its natural defences and its high wall, it would have been easy to defend. Evidence has been found for a single six metre diameter roundhouse within the fort, so it would only have housed a handful of people.
Specific Location: Nannau
With an entrance facing towards the north-east, this oval shaped hillfort is probably from the Iron Age. It lies at a height of 950 feet, on a promontory of a hill overlooking the Nannau estate and the Mawddach valley. The fort was small, being about 0.5 acres and the single wall enclosing the fort would have been about six feet high, but it is now quite trampled.
A tree known as Derwen Ceubren yr Ellyl (hollow tree of the demons/spirits) used to stand in Nannau Park and it had a reputation of being haunted and evil, for this is the tree in which Owain Glyndwr was, according to legend, supposed to have hidden the body of his cousin Hywel Sele, 8th Lord of Nannau after he had killed him in 1404.