QUOTE(Ian @ Aug 29 2008, 02:30 PM)

Not absolutely sure, but I found this reference (actually in connection with Henry VI Part II) :-
6. Triple crown: The tiara worn by the pope. It has three crowns.
Act 1 Scene 3
Queen: ...
But all his mind is bent to holiness,
To number Ave-Maries on his beads;
His champions are the prophets and apostles,
His weapons holy saws of sacred writ,
Are brazen images of canonized saints.
I would the college of the Cardinals
Would choose him Pope and carry him to Rome,
And set the triple crown upon his head—That were a state fit for his holiness.
Claims to Papal authority:
#13. "Hence the Pope is crowned with a triple crown, as king of heaven and of earth and of the lower regions."
(#13. Hinc Papa triplici corona coronatur tanquam rex coeli, terre et infernoram.")
Picture of triple crown here (together with citation for #13 above):
http://biblelight.net/claims.htm Nice bonnet...