The ogham inscription reads TOGITTACC MAQI SAGARET[TOS] — 'of Toicthech, son of Sáraid' — twenty-one strokes cut along the edge of a pillar that has stood here for roughly fifteen hundred years. Ogham was Ireland's first written script, a system of horizontal and angled notches incised along the edge of stones, and most surviving ogham pillars across Ireland are exactly this: grave markers naming a man and his father. The Ballywiheen stone is dated to roughly AD 500–550, placing it within the early Christian conversion of Munster. Whether Toicthech himself was Christian is uncertain. What is certain is that within a generation or two of his death, the slope around his grave was a Christian enclosure with an oratory and altars.

In 1998, archaeologists working at Ballywiheen turned up a stone lamp and a flint scraper. These are small objects but eloquent ones. The lamp suggests vigil-keeping in a building without windows — the kind of small oil-fed flame that would have lit the interior of the drystone oratory during liturgy or burial. The scraper points further back, beyond the Christian period, into a deeper layer of human use of this ground. People worked stone here in the way that prehistoric people worked stone everywhere along the Atlantic seaboard. Then they did not. Then they came back with crosses and altars and started building in stone again. The hillside remembers all of it.

Ballywiheen is ringed by an enclosure 68 metres across — the typical curving wall of an early Irish monastic site, marking off consecrated ground from the world outside. In the eastern part lie the remains of an early drystone oratory, the simplest form of Irish ecclesiastical building: thick walls, corbelled stones, a single narrow doorway. To the west, two mounds mark the position of leachtaí, low stone altars used as outdoor stations during processions and prayers. A cross slab incised with a Maltese cross stands near the oratory. Smaller grave mounds suggest a callúnach — an unconsecrated burial ground where, in later centuries, unbaptised infants and others denied churchyard rest were laid to ground. A four-foot stone cross still stands above them.

Immediately south of the Christian site sits Cathair na gCat — 'the cat's stone fort.' The cat, scholars suspect, is not the domestic kind but the cat crainn, the pine marten, a tree-dwelling cousin of the weasel that still haunts Irish woodlands. The cashel is a small drystone ringfort containing two stone huts and what may be a souterrain, an underground passage of the kind early medieval Irish farmers used for cold storage and refuge. Christian site and pagan-named fort stand within walking distance, their relationship now unknowable. They were probably neighbours rather than rivals — the family in the cashel, the holy men in the enclosure, the dead in their mounds — sharing the same patch of Atlantic hillside through a long quiet century.