The example at Tully in County Sligo is a rath, the term used for a ringfort constructed from earthworks rather than stone, typically a raised circular bank, sometimes doubled or tripled, enclosing a central living area. These were the farmsteads of early medieval Ireland, built and occupied roughly between the fifth and twelfth centuries, and the people who raised them were not chieftains or kings in the main but ordinary farming families who needed a defensible enclosure for themselves and their livestock.

Sligo as a county is geologically and historically layered in ways that make even a modest earthwork worth pausing over. The county sits between Lough Gill to the east and the Atlantic to the west, with drumlin fields, limestone pavements, and river valleys creating the kind of varied terrain that early agricultural communities sought out with some care. A rath in such a landscape would have been chosen for its position as much as anything else, often on a slight rise with good visibility across surrounding ground. The Tully townland name itself is an anglicisation of the Irish tulach, meaning a small hill or hillock, which suggests the local topography may well have influenced where the enclosure was sited in the first place.