Petri-Dom was the seat of bishops for half a millennium, and the burial place of King Frederick I of Denmark, whosetomb was carved in the 1550s by the renowned Flemish sculptor Cornelis Floris de Vriendt.
There certainly seems to be no shortage of believers, including Doug Preston, whose novel "The Codex" about a notorious treasure hunter and tomb robber who buries himself and his treasure as a final challenge to his three sons, is loosely based on Fenn's story.