Set into the church wall is a carved stone head, clearly depicting an ecclesiastical figure, most likely a bishop given the style of carving. The face shows careful detail work whilst the rear remains unfinished, suggesting it was always meant to be embedded in masonry. Below this weathered visage, fragments of what appears to be ornate window moulding survive, though these could equally be remnants from a tomb or decorative wall niche.

The rector shares a fascinating local tradition about this mysterious carving. According to village lore, the head represents Captain Mard, who served as benefactor to the nearby Killynard Church. Stories persist that a companion piece once existed; a second head said to depict Mard's wife, which remained in the area until as recently as the 1940s. Both heads allegedly served a rather unusual purpose, adorning the gateposts at the entrance to Killynard's old church and graveyard before finding their way to their current location.

Whilst the true identity and origins of this stone head remain uncertain, its presence connects Ballydevitt's relatively modern church to the deeper medieval history of the region. The Donegal Archaeological Survey has documented this curious relic, noting its likely ecclesiastical origins and the enduring oral traditions that surround it. Whether bishop or benefactor, this carved face continues to watch over the church, a tangible link to the stories and people who shaped this corner of Donegal centuries ago.