The combination is an odd one: a rath, the circular earthwork enclosure that served as a defended farmstead for an Irish family perhaps twelve or fifteen centuries ago, absorbed into the ornamental parkland of a later Anglo-Irish estate. These two worlds rarely acknowledged each other, yet the earthwork survived, as ringforts so often did, partly because superstition discouraged their removal and partly because a grassy mound can be a convenient feature in a demesne view.

Ringforts are among the most numerous monument types in Ireland, with tens of thousands recorded across the country, yet each one carries the trace of a particular household, a farming family of the early medieval period who threw up a bank and ditch around their home as a mark of status and a means of controlling livestock. The rath form, built from earth rather than stone, was especially common in the midlands and west. Birmingham Demesne takes its name from a family associated with the area in the post-medieval period, and the presence of a ringfort within its bounds suggests the land was farmed and settled long before any demesne wall was drawn around it. The earthwork effectively anchors the site to a period when the social order, the economy, and the very idea of who belonged to this ground were entirely different from anything the demesne era would have recognised.