Definitions for "Hierophant"
The presiding priest who initiated candidates at the Eleusinian mysteries;
one who teaches the mysteries and duties of a religion or an arcane discipline; an expositor; as, In his television series "Cosmos", Carl Sagan became the foremost hierophant of modern cosmology..
Originally the high priest of the Greek Mysteries at Eleusis. More generally, any priest of the Mysteries who reveals sacred secrets to initiates.
Keywords:  spokesperson, advocate
an advocate or spokesperson.
Keywords:  religious, figure
a religious figure
Keywords:  simply, power, person
a person of power, to put it simply