The minor mystery that engaged me for an hour was the translation and meaning behind the inscription on the steps beneath the feet of Prester John:
FVGE SVPERBIAN TERMy Italian is not strong, but I knew enough to figure out that FVGE is a verb meaning "flee," and that the second word in each admonition corresponds to one of the seven deadly sins:
FVGE LVXVRIA DELIGNO
FVGE GVLAM DEPLVMBO
FVGE IRAM DE FERRO
FVGE INVIDIAM DECVPRO
FVGE ACIDIAM DEARGENTO
FVGE AVARITIAM DE AVRO
superbian = pride
luxuria = extravagance
gulam = gluttony
iram = wrath
invidiam = envy
acidiam = sloth
avaritiam = greed
I was previously unfamiliar, however, with the association of certain elements with the seven deadly sins. There are seven "planetary" metals in alchemy: gold, silver, mercury, copper, lead, iron, and tin.
Dan Brown would eat this stuff up. Call me, Dan-O.