Carn Inghine Briain

Coggins’ Hill, Kilrusheighter — the eastern inauguration mound of the O’Dubhda of Tír Fiachrach

On the Aughris headland in north Co. Sligo, a two-tiered mound rises from a field of pasture above the Atlantic. Known locally as Coggins’ Hill, and in the medieval Irish record as Carn Inghine Briain — “the cairn of Brian’s daughter” — it is the best candidate for the inauguration site used by the O’Dubhda of Tír Fiachrach on the eastern side of the River Moy, across from Carn Amhalghaidh in Mayo.

A 2026 site visit with Dr Marion Dowd, MIAI, FSA — Lecturer in Archaeology at Atlantic Technological University, Sligo, and a specialist in Irish sacred landscapes — confirmed that the mound on Coggins’ Hill is almost certainly the remains of a castle, and quite possibly of an associated medieval settlement or small town, at GPS 54.27089, −8.78359 — the point identified on the ground by the current landowner. What is visible today has never been excavated; it lies beneath pasture on private farmland in the townland of Kilrusheighter, and is, in Dr Dowd’s phrase, “a found castle — it just needs to be dug.”

I. The “Invented Tradition” of an Eastern O’Dubhda Mound

The scholarly case for Coggins’ Hill was made most fully by the archaeologist Elizabeth FitzPatrick in Royal Inauguration in Gaelic Ireland, c.1100–1600: A Cultural Landscape Study (Four Courts, 2004). She argues that after the O’Dubhda reconquest of Tír Fiachrach in 1371, the family began to re-imagine its inauguration landscape on both sides of the Moy — so that the old western mound at Carn Amhalghaidh was paired with a new, eastern mound of equal ceremonial weight. This is what FitzPatrick calls an “invention of tradition”: not a fabrication in the modern sense, but a deliberate re-reading of the landscape to match a renewed political reality.

The medieval texts preserve the name Carn Inghine Briain without quite agreeing on where it stood. The Book of Lecan, compiled by the Mac Firbhisigh scholars in the early 15th century for the O’Dubhda court, refers to the site, and dindshenchas tradition attaches it to the daughter of Brian — a figure whose lineage linked the Uí Fhiachrach to the wider Connacht royal genealogy. By the time the Composition of Connacht was drawn up in the 16th century, the name was a living reference for those at the top of the kindred.

II. The Shape of the Mound — an Echo of Knocknarea

What makes Coggins’ Hill the strongest candidate for Carn Inghine Briain is the form of the mound. It rises in two distinct tiers: a broader lower platform, and a smaller capping tier on its summit. This profile — a stepped cairn on a natural rise — is a deliberate echo of Meadhbh’s Cairn on Knocknarea, across the bay to the east, which was by far the most famous ceremonial cairn in the wider region. FitzPatrick reads this as intentional: an inauguration mound for Tír Fiachrach that spoke, in its very silhouette, to the prestige of the Connacht heartland.

The seaward view reinforces the point. From the summit of Coggins’ Hill one looks north across the Atlantic to Aughris Head, east toward Knocknarea itself, and inland toward the Ox Mountains — a horizon that binds sea, cairn, and kingdom together. For a ruling kindred whose identity was rooted in control of the coastline from the Moy to the Ox, it is hard to imagine a site more eloquent.

III. Archaeology on the Ground

The mound sits in a working cattle field on the townland of Kilrusheighter, a short walk inland from the Aughris cliff-path. To the unfamiliar eye it reads as a rise in the pasture. To the trained eye, as Dr Dowd pointed out on the 2026 walkover, the ground tells a different story: worked stone breaking through the surface, a platform edge that does not belong to natural topography, and the broader footprint of what she believes was a castle — and possibly more than a castle. The precise location — 54.27089° N, 8.78359° W — was identified on the ground by the current landowner, whose family have worked this field for generations.

“There is a very good chance that an entire small town once stood in this field.”
— Dr Marion Dowd, field commentary, Coggins’ Hill walkover, 2026.

Nothing here has yet been subjected to formal excavation. The site is not signposted, is not on the National Monuments Service public-access list, and sits on private farmland. Its scholarly standing rests on FitzPatrick’s landscape reading, the surviving place-name, and now Dr Dowd’s field observations — an unusually complete combination of evidence for a site that remains visually understated.

IV. The Scurmore Alternative — and the Mermaid’s Children

A rival candidate for Carn Inghine Briain has been proposed at Scurmore, south of Enniscrone on the east bank of the Moy. The Scurmore site is associated with the “Children of the Mermaid” standing stones and the folk-tale of Tadhg Ruadh ó Dubhda and the sea-bride — a tradition linking the ruling line to the Atlantic itself. Scurmore has strong local currency, and Otway recorded a version of the story from Tyrawley tradition in 1841.

FitzPatrick prefers Coggins’ Hill on architectural grounds — the two-tiered form, the Knocknarea echo, and the surviving place-name. Scurmore is best read as a related site within the same ceremonial landscape rather than the primary mound: a shoreline station in a longer Moy-to-Aughris ritual geography.

V. The Last Inauguration, and the End of the Tradition

By the later 16th century the political ground under the O’Dubhda inauguration had shifted. The last O’Dubhda inauguration in living memory is remembered as having been intended for Coggins’ Hill, but in the event was held on a raised mound at Enniscrone Castle — a sign that by then the ceremony was being folded back into the fortified residence of the ruling branch, rather than performed in open country at an ancestral site.

The tradition ended formally in 1585. Under the Composition of Connacht — known locally as the “Indenture of Sligo” — O’Dubhda of Tír Fiachrach, together with every other Gaelic lord of the province, renounced the right to inaugurate his successor under native custom. The document explicitly names the kindred and the territory, and makes the submission a matter of English statute law. From that year forward, no O’Dubhda was ever again proclaimed at Carn Inghine Briain, Carn Amhalghaidh, or anywhere else under the old rite.

The mound on Coggins’ Hill stands untouched by plough or excavation — a heritage asset waiting for the work that will one day make its story fully visible.

Sources

• Elizabeth FitzPatrick, Royal Inauguration in Gaelic Ireland c.1100–1600: A Cultural Landscape Study (Four Courts / Boydell, 2004), §2.3 “The Invention of Tradition”, pp. 68–82 and Epilogue.
• Dr Marion Dowd, MIAI, FSA — Atlantic Technological University, Sligo — site visit and field commentary, 2026 (mariondowd.com).
• The Book of Lecan (Mac Firbhisigh), transcribed and edited in successive editions from the 19th century onward.
• John O’Donovan, The Genealogies, Tribes and Customs of Hy-Fiachrach (Dublin, 1844).
• Caesar Otway, Sketches in Erris and Tyrawley (Dublin, 1841) — for the Tadhg Ruadh tradition at Scurmore.
• Composition of Connacht / Indenture of Sligo, 1585 — signed by O’Dubhda of Tír Fiachrach among the Gaelic lords of Connacht.