Horizontal mills, sometimes called Norse mills or tide mills in their coastal variants, were among the earliest mechanised grain-processing technologies used in Ireland, relying on a wheel laid flat beneath the millstone rather than the more familiar vertical wheel of later centuries. They were once widespread across the island, and their remains tend to be modest, easily confused with the foundations of other rural structures.

The site at Brabstown came to the attention of the National Museum of Ireland in 1964, when the remains were investigated and interpreted as those of a horizontal water mill. The details of that investigation are sparse, but the identification points to a feature with real antiquity, horizontal mills having been in use in Ireland from at least the early medieval period. The record of the 1964 investigation was later communicated by Victor Buckley, placing this quiet County Kilkenny site within a broader tradition of mill archaeology that has helped piece together how rural communities once processed grain before the age of industrial milling.