Cloghermore Cave sits in this peculiar position: a site where two distinct populations, separated by time and culture, chose the same underground space to place their dead.

Excavations carried out over two seasons between 1999 and 2000 uncovered a remarkable accumulation of material. Alongside over 300 artefacts, the team recovered large quantities of disarticulated human and animal bone, cremated animal remains, and a single articulated burial, meaning one individual laid out intact rather than scattered or disturbed. Radiocarbon dating, with nineteen separate dates taken across the site, helped establish a two-phase sequence of use. The first phase points to a small, local, non-Christian population using the cave as a burial site during the 8th century, a period when Christianity was spreading steadily through Ireland but had not yet reached every community. The second phase is where the story becomes genuinely unusual: six burials of Scandinavian character were inserted into the cave in the late 9th century. This places them squarely within the Viking Age, when Norse settlers and raiders had established a sustained presence along Ireland's coastlines and river systems. The term "of Scandinavian character" suggests the burial practices, the grave goods, or both carried markers associated with Norse funerary traditions rather than local Irish ones. The combination, a pre-Christian Irish burial site later used by people from across the North Sea, makes Cloghermore a rare point of convergence between two worlds that otherwise left few traces of direct contact in the ground.