There are no earthworks, no ruins, no street patterns fossilised beneath the fields, just a quiet rural parish in south County Limerick where a functioning town once, apparently, existed. The settlement cluster at Effin survives in the historical record almost entirely by accident, its existence confirmed by a single rent entry in a medieval manuscript.

Effin lies roughly three kilometres south-west of Kilmallock, a town that was itself one of the more significant urban centres of medieval Munster. The earliest documentation for Effin comes from the Black Book of Limerick, a collection of ecclesiastical records, which places the manor in the hands of Maurice de Rochfort in 1287. The de Rochfort family were part of the Anglo-Norman settlement of Limerick, and the presence of a manor suggests a degree of organised landholding and administration. What elevates Effin from manor to borough, however, rests on a single entry in the Red Book of Kildare. In 1372, four marks and sixpence were recorded as rents returned to the wife of John Rochford for the burgagery of Effyn. A burgagery refers to the system of burgage plots, the long narrow land parcels assigned to burgesses, the free residents of a medieval borough, in exchange for fixed annual rents. That one rent return is the only evidence that Effin ever functioned as a borough in any formal sense. What happened to it afterwards is simply not known.

The Urban Survey of Limerick, compiled by Bradley and colleagues in 1989, noted that no surface trace of the borough survives, and suggested that whatever settlement existed was most likely concentrated near the parish church. That church, recorded in the Sites and Monuments Record for Limerick, remains the most tangible point of reference for anyone curious enough to visit. The surrounding landscape gives little away. This is, in some respects, the whole interest of the place; it asks you to take the historical record seriously while the ground offers nothing in return.