These circular enclosures, known in Irish as raths, were the farmsteads of early medieval Ireland, typically consisting of a raised earthen bank and outer ditch enclosing a domestic area where a family would have kept their home and livestock. There are estimated to be around 45,000 surviving examples across the island, which makes them one of the most common archaeological monument types in the country, yet individually they remain poorly understood, each one carrying its own particular history that has rarely been written down.

Carrowduff itself is a townland name derived from the Irish, likely meaning something along the lines of "black quarter land", a reference to land division and soil character that predates any ordnance mapping. Clare is county to a remarkable density of early medieval settlement remains, shaped in part by its geography, the limestone karst of the Burren to the north and the more fertile lowlands and drumlin country elsewhere providing varied but workable ground for farming communities across the early Christian period, roughly the fifth to the twelfth centuries. A rath like this one would have belonged to a farmer of some local standing, the enclosing bank serving as a boundary marker and a modest defence against opportunistic cattle raids as much as any serious military threat.