Cwm Garw, Ty-newydd
Two standing megalithic stones, separated by about 25 feet, in Dyfed, Wales.
They are said to be a monument to the sons of King Arthur who were killed by the boar Twrch Trwyth, which caused havoc in their encampent having swum over from Ireland. The story is told in great detail in the Mabinogion.
The name “Cerrig Meibion Arthur” translates to “The Stones of the Sons of Arthur.”
Located on a ridge above the stones are above the stones are Cerrig Marchogion.
Note
– Cerrig means “stones” in Welsh.
– Ty generally means a house, a dwelling-place, but in Welsh it occasionally is used to mean a church or place of worship, such as Ty Ddewi.
Source
Culhwch and Olwen | Late 11th century