Deserted medieval settlements are among the quieter puzzles of the Irish landscape, places where people once farmed, traded, and buried their dead, and then, for reasons that varied from plague to famine to landlord clearance, ceased to do so. What remains is typically a scatter of earthworks, collapsed walls, and subtly raised or sunken ground that only becomes legible once you know what you are looking at.

Isertkelly itself carries a name with ecclesiastical roots. The Irish "diseart" refers to a hermitage or place of religious retreat, suggesting that long before any medieval village took shape here, the site may have had an earlier devotional significance. This kind of layering is not unusual in the west of Ireland, where early Christian foundations and later secular settlement often occupied the same ground, drawn together by water, shelter, or the accumulated sanctity of a place. The medieval period in Connacht was one of shifting power between Gaelic lordships and Anglo-Norman interests, and many small rural settlements caught between those pressures simply did not survive into the early modern era.