What is known is that it bears a classified enclosure, a term covering a broad range of man-made boundaries, from early medieval cashels built of dry stone to simple field systems that once organised livestock and agriculture on marginal island land. The fact that someone went to the trouble of enclosing ground on so small and remote a place is itself worth pausing over.

Ireland's western islands were not always the isolated outposts they can seem today. From the early medieval period onward, small island communities farmed, fished, and maintained ecclesiastical or secular settlements in places that would strike a modern visitor as barely habitable. An enclosure on an island like Illaunonearaun fits into a pattern of occupation across the Burren coast and its attendant islets, where the limestone landscape made stone construction practical and the surrounding waters provided both food and a degree of natural defence. Without more detailed survey information in the public domain, the precise date, form, and function of this particular enclosure remains open, but its existence on the record places the island among the many small Clare sites that hint at a much more densely peopled past than the landscape currently suggests.