Coflein site entry:
"At Careg-Croes-Ifor (The stone of Ivor's Cross) are two cairns or heaps of stones whose origins are lost in antiquity.
(Source: J.A.Bradney, History of Monmouthshire, 1904, pt.1, pp.352, 399.)
All that remains of the two cairns at Pwll-du is a scatter of stones. The cairns seem to have been of simple construction and upon examination no trace was found of either burials or the structures that might have contained them.
(Source: W.F.Grimes, Excavations on Defence Sites 1939-45, 1960, p.248)
There are no visible remains of the cairns. They have been destroyed by open-cast coal mining.
(Source: OS 495 card: SO21SW10)
Carreg Maen Taro (nprn 260725), a marker stone about 1km away to the north west, was traditionally said to have been erected to commemorate a battle between two early British kings or chiefs, one of whom was called Ifor, and Pen-ffordd-goch (the head of the red road) (nprn 404999), some 600m to the east, is said to take its name from a battle waged there; there thus seems to be a vague tradition of a battle fought somewhere in the area.
B.A.Malaws, RCAHMW, 13 October 2006."
https://coflein.gov.uk/en/site/405021/details/two-cairns-careg-croes-ifor-pwll-du-blaenavon
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