A rath, or ringfort, is one of the most familiar monument types in Ireland, a roughly circular enclosure defined by one or more banks and ditches, built during the early medieval period, roughly between the fifth and twelfth centuries, and used as a farmstead and place of shelter for a family and their livestock. There are tens of thousands of them recorded across the island, yet each one occupies a particular patch of ground chosen with deliberate care, typically on well-drained, slightly elevated terrain with good sightlines across the surrounding countryside.

Tullagubbeen itself is a small townland in Kerry, and the presence of a rath there places it within the wider pattern of early medieval settlement that shaped this part of Munster. The people who built and lived within these enclosures were farmers and pastoralists, and the ringfort was as much a statement of land tenure and social standing as it was a practical structure. In local folklore across Ireland, raths became associated with the otherworld and with the fairy mounds known as lios, which gave many of them a certain protective reputation and may help explain why so many survived agricultural clearances that removed other ancient features from the land.