These altars, known as Mass rocks or Penal Mass stations, served as clandestine places of worship when Catholic religious practices were heavily restricted. This particular altar wasn't recorded on early Ordnance Survey maps from 1834, only appearing for the first time on the revised 6-inch OS map of 1848.

The six altars in this area were documented by the Ordnance Survey Revision Name Book, which described them as "old Roman Catholic altars for the celebration of mass", according to J. Byrne's account. These simple stone structures represent a poignant chapter in Irish history, when priests and congregations risked severe penalties to practice their faith. Mass rocks like these were typically located in remote areas, often with natural features that provided concealment and allowed lookouts to warn of approaching authorities.

Today, this altar stands as a tangible connection to a time when religious freedom couldn't be taken for granted. The late recognition of these sites on official maps; they weren't included until fourteen years after the initial survey; speaks to their secretive nature and perhaps to changing attitudes towards Catholic heritage in the mid-19th century. For visitors interested in Ireland's complex religious history, these humble stone altars offer a powerful glimpse into the resilience of communities who maintained their traditions despite official suppression.