These structures are found across Ireland in their hundreds, dug into the earth beside ringforts and settlement sites, and their precise purpose has long been debated. Refrigeration, refuge, ritual use, simple storage; archaeologists have argued for all of these, and the honest answer is probably that different souterrains served different purposes at different times. What they share is a quality of deliberate concealment, a decision by the people who built them to put something, or someone, out of sight.

The souterrain at Grange sits in a part of Sligo with considerable early historic significance. Grange is a townland name derived from the Latin grangia, referring to an outlying farm or storehouse associated with a monastic or manorial estate, which hints at a long history of organised settlement in the area. Souterrains of this type typically date to somewhere between the seventh and twelfth centuries, constructed using dry-stone walling and large capstones to roof the passages, and they often survive remarkably intact precisely because they were built underground and left undisturbed. Beyond the fact of its existence and its location in this Sligo townland, the detailed particulars of this specific site remain largely undocumented in publicly accessible form.