Visio | Microsoft Visio |
In his 1984 book The Birth of Purgatory, he argued that the conception of purgatory as a physical place, rather than merely as a state, dates to the 12th century, the heyday of medieval otherworld-journey narratives such as the Irish Visio Tnugdali, and of pilgrims' tales about St Patrick's Purgatory, a cavelike entrance to purgatory on a remote island in Ireland.