Known as the Magnus and Fergus graveslab, this 16th-century carved stone memorial stretches 1.85 metres in length and tells a fascinating story through its elaborate decorative carvings. The slab bears an inscription in medieval Irish that reveals its makers and purpose: “Fergus Mac Allan made this stone Magnus Mac Orristin under this”, carved in slanting lines across the upper portion of the monument. Though local tradition once claimed the stone was brought from Scotland, scholars have since confirmed its Irish origins, dismissing the romantic tale of its cross-channel journey.

The artistry of the graveslab showcases the skill of medieval Irish stone carvers, with its surface divided by a central cross that spans the entire length and width of the stone. Each arm of the cross terminates in an elegant triple-leaf motif, whilst the shaft itself transforms into two intertwined, long-necked bird-like figures near the top; a design that speaks to both Christian symbolism and Celtic artistic traditions. At the base, the cross shaft splays into delicate, symmetrical foliage that fills the lower portion of the slab with intricate vine-like patterns. The quadrants flanking the cross reveal unexpected details about the life of Magnus Mac Orristin: on one side, a sword with an ornate pommel suggests his warrior status, whilst a hurley stick and sliotar hint at his sporting pursuits, making this one of the earliest depictions of hurling equipment in Irish art.

The false relief technique used to create these carvings, where the designs appear raised from the surface, demonstrates sophisticated craftsmanship typical of 16th-century Irish memorial art. Two fleur-de-lys motifs fill spaces where inscription lines end abruptly, adding a touch of continental influence to this distinctly Irish monument. Now protected as a National Monument in state ownership, the graveslab stands alongside other medieval stones in Clonca church, including another medieval graveslab mounted on the adjacent wall and a late 17th-century example set into the church floor, creating a remarkable collection that chronicles centuries of commemorative art in this corner of Donegal.