What makes it quietly remarkable is not just the inscription itself but the slow, piecemeal way the text was recovered across nearly a century and a half, fragment by fragment, from the shore below Brecaun Church at Portersgate in Co. Wexford.

Ogham is an early medieval script, typically carved as a series of notches and lines along the edge of a stone, used mainly in Ireland between roughly the fourth and seventh centuries to record names and lineages in an early form of Irish. The first fragments of this particular stone came to light in 1845, noted by Barry in 1896, but the text remained incomplete. Around 1930, another piece surfaced and allowed the scholar R.A.S. Macalister to reconstruct the inscription as SEDAN [MAQQI CAT]TABGBOTT AVVI DERCMASOC, reading it as a genealogical formula naming an individual as a descendant of Derc Masoc. Macalister recorded the stone's dimensions as approximately 1.18 metres long, 0.3 metres wide, and 0.2 metres thick. In the mythological history of early Ireland, Derc Masoc was the son of Cathair Mór, described as one of the first kings to have ruled all of Ireland, and the progenitor of the Uí Deirc Mosaig, the ruling family of Ath Cliath Cualann, the area that would become Dublin. The final missing piece of the stone was recovered during archaeological excavation in 1987, as recorded by Breen in 1988, completing a puzzle that had taken over a hundred and forty years to solve.

The stone is now held at a location in Dublin South City rather than at its original find site in Wexford, so anyone seeking it out should check in advance with the relevant institution for access arrangements and precise location within the collection. The Wexford context, the shoreline below Brecaun Church at Portersgate, is worth bearing in mind when handling the stone intellectually: it arrived at the coast as fragments, possibly displaced long before the nineteenth century from an earlier setting. For those with an interest in early Irish epigraphy or genealogy, it is worth looking closely at the surviving notches along the stone's edge, where the gradual reconstruction of a name, and through it a claim to ancient authority over the Dublin region, becomes a tangible thing.