It is quite possible the last authentic pope was around mid-20th century.
I checked out just past that point. Happened when I was sitting in Parish Church I had grown up in, on a Sunday morning, in uniform having just returned from a year overseas, and listed to a priest sermonize that everyone should remember in their prayers those brave men that had shown the courage to resist the unjust war in Viet Nam.
The secular humanist cancer had started to eat away at the soul of the Church long before the current pope.