The PP was definitely part of the papal signature before Wojtyla (Cite: This picture of a document signed by Pius IX., 1846-1878, where the abbreviation appears).
I assume it simply stands for “papa,” the vowels having been omitted.
The PP was definitely part of the papal signature before Wojtyla (Cite: This picture of a document signed by Pius IX., 1846-1878, where the abbreviation appears).
I assume it simply stands for “papa,” the vowels having been omitted.