The stone is set into the floor near the north wall towards the east end of what was once the nave of the medieval parish church of St John the Baptist, a building now absorbed into Holy Trinity Church of Ireland. Most visitors to Fethard, if they notice the church at all, are unlikely to suspect that the organ room contains a legible inscription from 1680, still readable in Roman capitals around the border of a tapering limestone slab.

The slab measures 1.88 metres in length and tapers from 0.62 metres at the top to 0.58 metres at the base, a standard coffin shape in stone that was common for commemorative slabs of the period. Its inscription records the death of An Cooke, also named Alyes Langly, the wife of Peeter Cooke, described as a burgess of Fethard. A burgess was a recognised freeman of a town, typically holding civic or commercial standing, which places the Cooke family among the more established inhabitants of the town in the late seventeenth century. She died on the 12th of February 1680. The centre of the slab carries no decorative carving, which is itself slightly unusual; many comparable slabs of the era feature a cross, a coat of arms, or religious imagery. Whether that plainness was a matter of economy, preference, or simply an unfinished commission is not recorded. The spelling throughout the inscription follows the conventions of the period, with "ye" used for "the" and "alyes" likely a rendering of "alias", indicating that Alyes Langly was her name before marriage.