Mullinabreena

Long before the medieval monastery and bishopric gave Achonry its later historical importance, the surrounding landscape already preserved evidence of prehistoric settlement, burial, and ritual activity. Across the low ridges and pastureland surrounding Achonry survives a notable concentration of ancient monuments dating to the later Neolithic and Bronze Age periods, including ring-barrows, burial mounds, enclosures, and one of the more unusual prehistoric monuments in County Sligo, the Achonry boulder burial (SL032-189). Together these monuments suggest that the area formed an important funerary and ceremonial landscape thousands of years before the establishment of the medieval ecclesiastical centre.

Figure 1: The Achonry boulder burial with Knocknashee visible in the background. The monument consists of a large capstone raised upon supporting boulders and is generally regarded as belonging to the Bronze Age boulder-burial tradition of western Ireland.

The Achonry boulder burial stands on a north-facing slope below a low ridge overlooking the surrounding countryside. The monument consists of a large upper boulder deliberately raised upon three supporting stones, with a small pad-stone placed beneath one side of the capstone. Measuring approximately 3.55 metres by 2.55 metres, the upper stone dominates the structure despite the monument’s relatively modest setting within the landscape. The arrangement of the supporting stones strongly suggests deliberate human construction rather than a natural geological formation.

The monument was examined by archaeologist Seán Ó Nualláin during his survey of the megalithic tombs of County Sligo. Ó Nualláin noted that the structure lacked the formal chamber and cairn associated with earlier megalithic tombs and instead possessed affinities with the boulder-burial tradition generally associated with Bronze Age Ireland. Boulder burials remain one of the more poorly understood prehistoric monument types in Ireland. Though their precise function is uncertain, excavated examples elsewhere have produced evidence of funerary and ritual activity broadly dating to the Bronze Age. Most known examples are concentrated in the south-west of Ireland, particularly Cork and Kerry, while a smaller number survive across western Connacht including Sligo, Mayo, and Galway. The Achonry example therefore represents part of a comparatively rare north-western distribution of this monument type.

Figure 2: Plan and elevation of the Achonry boulder burial from Seán Ó Nualláin’s Survey of the Megalithic Tombs of Ireland, Volume V: County Sligo (1989). The illustration shows the raised capstone, supporting boulders, and pad-stone which led Ó Nualláin to identify the monument as having affinities with the Bronze Age boulder-burial tradition.

The monument also survives within a wider concentration of prehistoric barrows and burial monuments surrounding Achonry. Among the best preserved is the ring-barrow recorded as SL038-011, situated immediately west of the modern church. This monument consists of a circular mound enclosed by a fosse and outer bank, with causeways crossing the ditch at two points. Nearby survives the ditch-barrow SL038-012, while further ring-barrows and possible burial mounds occur at SL038-015, SL038-017, SL038-013, and SL032-182. Other possible barrows once existed nearby but have since been levelled or damaged by quarrying and agricultural activity.

Though varying in size and preservation, these monuments share several common characteristics. Many occupy low ridges, gentle slopes, or slightly elevated ground overlooking the surrounding landscape. Several are enclosed by ditches and external banks, features commonly associated with Bronze Age funerary monuments elsewhere in Ireland. Ring-barrows and ditch-barrows of this type are generally regarded as Bronze Age burial monuments and likely belong broadly to the same later prehistoric period as the Achonry boulder burial. Although it is impossible to determine whether the monuments were directly connected, their concentration within the same landscape suggests that the area retained ceremonial and funerary importance over a long period during later prehistory.

The setting of the Achonry monuments is also notable. From the surrounding ridges there are views eastward toward Keashcorran and westward toward Muckelty Hill, both landscapes associated with ancient monuments and long traditions of human activity. Throughout south Sligo prehistoric burial monuments repeatedly appear in visually prominent positions within the landscape, particularly along ridges and elevated slopes. The positioning of the Achonry boulder burial and surrounding barrows may reflect similar concerns with visibility, memory, and the marking of important places within the prehistoric landscape.

Several of the monuments also preserved traces of local folklore into modern times. The boulder burial itself was marked as a “Giants Grave” on the 1914 Ordnance Survey map, reflecting a widespread folk tradition in which prehistoric burial monuments became associated with giants or ancient burials long after their original purpose had been forgotten. Similar traditions survive elsewhere across the parish and wider south Sligo landscape, preserving echoes of the importance these places once held within local memory.

Today the monuments surrounding Achonry survive as scattered earthworks, stones, and low rises within the modern agricultural landscape. Yet together the boulder burial and surrounding barrows preserve evidence of a much older Achonry, one shaped by prehistoric communities thousands of years before the medieval church and settlement emerged nearby. Although the exact purpose of many of these monuments may never be fully understood, the landscape around Achonry remains one of the most important prehistoric survivals within the wider Achonry–Mullinabreena area.

Sources

Seán Ó Nualláin, Survey of the Megalithic Tombs of Ireland, Volume V: County Sligo (Dublin: Stationery Office, 1989), pp. 98–99.

Ursula Egan, Elizabeth Byrne, Mary Sleeman, Sheila Ronan and Connie Murphy, Archaeological Inventory of County Sligo (Dublin: Stationery Office, 2005).

National Monuments Service, Historic Environment Viewer, Department of Housing, Local Government and Heritage.