Hierarch

Hierarch was one of the Philosophers of Ephebe mentioned in Small Gods. His magnum opus was Theologies.

Annotation

On Roundworld, a hierarch is literally "One who occupies a position of authority in a religious hierarchy". A hierarchy is a body of people (often clergy) organized into successive ranks or grades with each level subordinate to the one above. So he ought to be capable of writing about different theologies. Wonder if he was as dangerous to be around as Abraxas? Or perhaps he wrote very very carefully about how people worked through their relationships with their Gods.