The limestone Fox wall monument is only partially intact, the reclining effigy of its subject surviving from the torso to the thighs, the legs lost entirely. What remains, though, is far from simple. Paired Ionic columns rise from either side of an altar-type base, supporting entablatures whose dentillated cornices, rows of small tooth-like projections in the classical style, curve into a round arch. Within that arch sits a heraldic achievement above a Latin inscription, flanked by shields. Greek sphinxes stand guard either side of the arch, cherubs occupy the spandrels, and the whole composition is capped by strapwork ornament forming a loose pediment, with obelisks to either side. For a rural Longford church, it is an unusually ambitious piece of early seventeenth-century monument-making.

The man commemorated is Nathaniel Fox of Rathreagh, who died on the 2nd of February 1634, aged forty-six. The Latin inscription, translated in an 1895 publication by the antiquarian Du Noyer, is unusually detailed in the way such memorials rarely are. It records that Fox was the son and heir of Patrick Fox, a soldier from Moynor in County Westmeath, and that Nathaniel himself founded the very church in which the monument stands. He married Elizabeth, daughter of Walter Hussy of Moyl-Hussy, and together they had eight sons and five daughters, of whom eight sons and three daughters were still living at the time of his death. The inscription also notes that his son and heir Patrick married Barbara, daughter of Patrick Plunket, Baron of Dunsany, a detail that situates the Fox family within the network of Old English Catholic gentry that shaped much of the Irish midlands in that period. The monument's classical vocabulary, sphinxes, Ionic columns, cherub-filled spandrels, points to a craftsman working in a European Renaissance tradition that had reached Ireland by the early 1600s, however unevenly.