Beddau Gwyr Ardudwy, the 'graves of the men of Ardudwy', are mentioned as early as the C17 by Edward Lhuyd, when there were said to be 30 graves with stones set at each corner. One of the stones was said to bear an inscription. Richard Fenton visited in 1813 and thought the graves were prehistoric burials, the stones of which were plundered to build the Roman road. Most of the stones are said to have gone by 1851 and the mounds were mostly gone by 1870.

Eight small mounds remain at the site, although they are labelled as pillow mounds by the Ordnance Survey. The mounds are slight and small and are unlikely to have been pillow mounds. The largest of the mounds, at SH7230642579 is 6m by 4m wide and 0.2m high. Another mound close by at SH7232442572 has a stone at the NE end that may have been part of a kerb. The other mounds are at SH7219242598, SH7221342596, SH7224642589, SH7229242666, SH7235742644, SH7236042638. Five other mounds were surveyed by the Ordnance Survey, but these were either rejected, or the remains were too slight to make a confident identification. Excavation of one mound in advance of laying a new water main showed it to have been a peat mound.

A replica stone was set up in 2006, known as the Cantiorix Stone, to replace the inscribed stone that was said to have been removed from the site and is now in Penmachno church. It stands next to a storage reservoir at SH7250142699. It reads 'Cantiorix lies here / he was a citizen of Venedos / cousin / of Maglos the magistrate'.

RCAHM Wales, Merioneth (1920), pp 25-28.
Archaeologia Cambrensis vol 2.2, 1851
R Fenton, Tours in Wales (1917), p 124.
D Longley, Archaeology in Wales 30 (1998), p 56.

Recorded as part of RCAHMW Uplands Initiative Project, R Hayman, H & H, 07/02/2014.