Standing stones, erected across Ireland during the Bronze Age and possibly earlier, were set upright for reasons that remain genuinely contested: territorial markers, astronomical alignments, commemorations of the dead, or something else entirely that no longer maps onto any category we use. This one at Lissaniska is recorded as a monument, which means someone at some point noted it, measured it, and confirmed it was deliberate rather than accidental. Beyond that, the documentary record is currently thin.