If I understood the like 600 yo (?) prophecy of the popes, he was supposed to be it. The last pope. If I understood it correctly, as it was supposedly prophesied (not necessarily believed of course), he was supposed to be the false prophet mentioned here:

But the beast was captured, and with it the false prophet who had performed the signs on its behalf. With these signs he had deluded those who had received the mark of the beast and worshiped its image. The two of them were thrown alive into the fiery lake of burning sulfur. Revelation 19:20 NIV

https://bible.com/bible/111/rev.19.20.NIV