Sorry, I missed this reference before I brought him up later in the thread. I agree he is interesting, but on further thought, I keep coming back to the Pope, Philip or Philippe. were it Munk, Q would have said (PM), and Peterson would have been (PP).
So, who is a one-named P? The three I mentioned and who else? I dismiss out of hand the Pindar, Pole, and similar theories. No one takes orders from a position. One takes orders from a person (or office in lieu of the person, as in, 'I report to the Pope.')