Situated on the lower SSW slopes of Slievenaglogh. Two stones, one positioned on top of the other, incorporated into a boundary fence. Mass celebrated here during Penal times (O.S. Memoranda 6718A & B).
92295,LH01790,MARO,LH022-005002-,LOUTH,CALLYSTOWN,R180709,716065,784788,53.799678510000000,-6.238107980000000,Mass-rock,Not indicated,’St. Dennis’s Alter’,https://heritagedata.maps.arcgis.com/apps/webappviewer/index.html?id=0c9eb9575b544081b0d296436d8f60f8&query=18a4b61b268-layer-9%2CSMRS%2CLH022-005002-,Marked on the 1912 OS 6-inch map as ‘St. Dennis’s Altar’. A large rectangular slab with a flat surface set on outcrop

Monument Type: Mass-rock

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