What survives at Commons in County Kildare is barely a metre high, grass-covered, and easy to miss entirely. Yet these low, mortared limestone walls, with their occasional blocks of tufa, a soft volcanic stone sometimes used by medieval builders for its workability and light weight, once formed a church dedicated to St. Kevin, positioned along the old pilgrimage route running from Naas to Glendalough. The idea that medieval travellers moved through this quiet corner of Kildare, making their way towards Kevin's monastic site in the Wicklow mountains, gives the ruin a quiet gravity that its modest dimensions do not immediately suggest.

The church was recorded as part of the combined dioceses of Dublin and Glendalough as early as 1216, placing it within an ecclesiastical geography that linked the Leinster lowlands to the upland monastery. The structure consists of a nave, measuring at least 15.8 metres east to west and 6.5 metres north to south, and a chancel that may have been added later, roughly 9.6 metres by 4.2 metres. The whole thing sits on a slope, which accounts for the two buttresses built against the northern wall to shore it up against the downhill lean. By 1609, when a visitation report made its last mention of the building, the church was presumably already in decline. Within the surrounding graveyard, three cross slabs and a fragment of a baptismal font were recorded in 1985, objects that hint at the devotional life once centred here. An old laneway running just to the north of the site may itself have formed part of the pilgrim road, a possibility that makes even the approach to the ruins feel like it carries some faint trace of earlier movement.