These are the graves of children, most likely unbaptised infants, interred in a place that sat outside the consecrated ground reserved for those who had received the sacraments of the Church. Sites of this kind are known in Irish as cillíní, and they appear in their hundreds across the Irish landscape, tucked into field corners, coastal headlands, and old ringfort enclosures. For centuries, the Catholic Church held that unbaptised children could not be buried in consecrated ground, and so families brought their infants, often in the quiet of night, to these liminal places.

Acaill Bheag sits in Clew Bay, in the shadow of its much larger neighbour Achill Island. The practice of burying unbaptised children in cillíní was widespread in Ireland from the medieval period through to the mid-twentieth century, when attitudes and Church practice gradually shifted. The grief involved was compounded by the secrecy often surrounding such burials, with little or no formal ceremony permitted. The graves themselves are typically unmarked, or marked only with small stones, which makes these sites both archaeologically subtle and emotionally charged. Their presence on small islands like Acaill Bheag speaks to how thoroughly the practice was woven into rural and coastal Irish life, even in the most remote communities.