D. lettered not in Roman script but in Cló Gaelach, the traditional Gaelic typeface more often associated with manuscripts and early printed texts than with the stonework of an Anglo-Irish estate. It is a small, quietly contradictory detail on a building that has accumulated several identities across three and a half centuries.

The house at Swiftsheath as it largely appears today is a seven-bay, two-storey Classical-style structure over a basement, built around 1750 but enclosing the bones of that earlier 1651 house within its fabric. The west-facing front comprises a five-bay recessed section with pedimented middle bays and a projecting flat-roofed porch, while the south elevation presents a seven-bay garden front with a three-bay return to the southeast. A substantial renovation was carried out around 1850, giving the building much of its current appearance. The connection to the 1651 structure survives most tangibly in that datestone, positioned above the second pilaster from the recessed northern end. The house takes its name from the Swift family, and according to Mark Bence-Jones writing in 1978, it served as the boyhood home of Jonathan Swift, born in 1667 and later Dean of St Patrick's Cathedral in Dublin, the author of Gulliver's Travels and A Modest Proposal. Swift was raised here by his uncle, Godwin Swift, who held the position of Attorney-General to the Duke of Ormonde for the County Palatine of Tipperary, a jurisdictional role tied to the semi-autonomous palatine administration that the powerful Butler family, the Dukes of Ormonde, exercised over much of Tipperary. That a future satirist of empire and institutional authority spent his formative years in a household so embedded in the machinery of that same authority is the sort of irony Swift himself might have appreciated.