In Lough Derg, lake in the Irish county of Donegal, there is an island, sacred to both pre-Christian and Christian Celts, which achieved fame in the Middle Ages as goal for pilgrims and an entrance to purgatory. Here, according to tradition, St. found way to convert the pagan Irish through graphic demonstration of the pains of the damned and the joys of the blessed. Thousands of pilgrims travelled to the of St. Patrick where, locked inside its cave-like cell, some would see extraordinary visions extending their pilgrimage into the other world. Those who survived the ordeal were said to be exempt from the pains of purgatory after death. The reports they brought back to the parishes and monasteries of Western Europe greatly augmented the stock of visionary testimony, providing an abundant resource for didactic and allegorical invention. The pilgrimage to St. Patrick's Purgatory continued to flourish in spite of the skepticism of Renaissance humanists and the attacks of the Reformers. Since the final destruction of the cave in the eighteenth century, however, the Purgatory has become setting for penitential exercises rather than otherworldly excursions. Today it draws close to fifteen thousand pilgrims and tourists each year. According to Victor and Edith Turner, Lough Derg has become a kind of national totemic center.'
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