Megalithic monuments, a broad category covering everything from portal tombs and passage graves to court cairns and standing stone alignments, were built across Ireland roughly between 4000 and 2000 BC, during the Neolithic and early Bronze Age periods. They required communal effort on a considerable scale, and their precise purposes, whether funerary, ceremonial, or calendrical, remain a matter of ongoing debate among archaeologists. That one such structure exists at Tallowroe places this quiet Galway townland within a pattern of prehistoric activity that stretches across the country, though the specific form this particular monument takes is not currently documented in any publicly available record.