This site is of disputed antiquity. If you have any information that could help clarify this site's authenticity, please post below or leave a post in the forum.
There's conflicting opinion about what this site is. The RCAMW list it as a Pillow Mound (something they seem to categorise as a natural feature). Cadw list the site as a Long barrow, and Cambria Archaeology list it as a possible Chambered Tomb or Long Barrow.