St. Patrick’s Purgatory, more commonly referred to as Lough Derg because of its location in the lake of the same name in Co Donegal, is a pilgrimage site which dates back to the Fifth Century. Since then, uninterrupted for over 1500 years, it has been a place of Christian pilgrimage and prayer. The pilgrimage takes place on Station Island, and it has St. Patrick as its patron. The original monastery on Saints Island in the same lake claimed St Davog, one of Patrick’s disciples, as its founder abbot.