Station Island, along with its neighbour Saint’s Island, has drawn the faithful for over 1,500 years to a place known as St. Patrick’s Purgatory. Legend holds that St. Patrick founded a monastic settlement here in the fifth century, appointing Dabheoc as its first abbot. The original monastery likely stood on Saint’s Island, which later became an Augustinian priory under Armagh’s Abbey of SS Peter and Paul in the 1130s before its suppression in the late sixteenth century. The monks’ primary duty was tending to the countless pilgrims who journeyed to visit the famous cave where, according to medieval tradition, St. Patrick experienced visions of purgatory.

The pilgrimage route itself tells a story of centuries of devotion. An ancient roadway from Pettigo village winds past Rathnacross ringfort and the old church at Templecarn before reaching the southwestern shore of the lake, where remnants of stone supports mark the location of a wooden bridge that once connected the mainland to Saint’s Island. Natural features around the lough acquired sacred significance; St. Brigid’s Chair, an L-shaped boulder on the southeastern shore, and St. Dabheoc’s Seat, which once featured a stone seat before a grave-like opening on a nearby hill, though the latter has since vanished beneath forest growth.

Today, Station Island is dominated by a twentieth-century basilica and administrative buildings, but fragments of its medieval past remain scattered across the grounds. The penal beds, circular stone structures roughly 2.8 metres in diameter that resemble clochán foundations, serve as stations for modern pilgrims. More ancient artefacts include St. Patrick’s Cross, a 1.3-metre cylindrical shaft decorated with spiral tracery, reportedly transferred from Saint’s Island, and various stone fragments built into modern walls; a broken cross head with a central depression ringed by a raised band, and a small font bearing a partially legible inscription that nineteenth-century observers read as “MANUS COIVANI”. These weathered stones serve as tangible links to the countless medieval pilgrims who made Lough Derg one of Christendom’s most celebrated destinations.