Set into a graveyard wall in Lullymore rather than displayed on a plinth or behind glass, a small sandstone slab carries a carved cross that has quietly outlasted the monastery it once belonged to. The stone is modest in scale, measuring just 31 centimetres long and 17 centimetres wide, and it is partly damaged, yet the design carved into its face remains legible: an almost equal-armed cross with expanded terminals, meaning the arms flare slightly outward at their ends, a form common in early medieval Irish stone carving. It is one of three such stones built into the graveyard wall at this site, each one a fragment of a larger devotional landscape.

The graveyard at Lullymore forms part of an early monastic site, one of many that once dotted the raised bogs and drier islands of County Kildare. Cross-inscribed stones, which are essentially flat slabs or boulders incised with a cross rather than shaped into a freestanding monument, were used throughout the early Christian period in Ireland to mark sacred ground, grave plots, or boundaries of ecclesiastical enclosures. The Lullymore stone is catalogued as 'Cross 13' in M. Kelly's 2006 study of the site's carved stones. That study also accounts for a remarkable dispersal of material from the same graveyard: seven further cross-inscribed stones and two cross-slabs were removed from the site and incorporated into a memorial erected in 1798, embedding early medieval carvings into a monument commemorating a very different moment in Irish history. A further cross-inscribed stone from the same complex has since ended up in the Bog of Allen Nature Centre Museum, suggesting that the collection here was once considerably larger than what remains in situ.