That much is certain. What is not certain is when it was built, who built it, or quite what survives of it today. It has been formally recorded as a monument, given a classification, and assigned to a place, yet its date remains officially indeterminate, a category that in archaeological terms covers everything from a medieval dwelling to a post-medieval farmstead whose records simply never made it into the written record.

An Cheathrú Gharbh, whose name translates roughly from the Irish as the rough quarter, sits in a part of Mayo where the landscape itself tends to resist easy documentation. The west of Ireland is scattered with the remains of houses that were abandoned, repaired, rebuilt, and abandoned again across centuries of shifting fortune, and many resist confident dating without excavation or detailed architectural survey. A structure classified only as a house of indeterminate date occupies an ambiguous but not unusual place in the archaeological record of rural Connacht, where continuity of site use could blur the boundaries between one period and another.