a small pedantic point that QI** likes to trot out. The only person who takes the official title of "Pope" is head of the orthodox church (can't remember if Greek or Russian).
For the Catholic head of the church, titles like (?) Most Holy Father and Pontif are on the list, but apparently not Pope. per se.

** a spoof panel game that likes to trot out facts to wrong foot contestants, couched within such narrow limits as to be barely true a lot of the time. eg contrary (ish) to popular myth they think coffee has more caffeine than tea, and for all their precision neglect to qualify coffee as "filter" or "machine". It would not be as funny to have to point out that instant coffee has less!

And how many red shoes (pairs) has the Pontif got? I am currently running (dancing actually) at 12.