The apparent site of the burial ground associated with an early medieval keeill or chapel, which would have been in use during the period circa AD500-AD1000.  Lintel graves were found at Folieu in 1905 when digging drains for a new house at Port-y-Vullen, close to the brooghs, in the field numbered as Plot 388 on the 1870 1:2500 scale Ordnance Survey map.  These were thought to be Christian graves marking the site of a keeill of which no other traces remain.  A small cross-slab has also been found here (PRN 0600.30).