Furthermore, we declare, we proclaim, we define that it is absolutely necessary for salvation that every human creature be subject to the Roman Pontiff.

boniface viii, unam sanctam, 1302 a.D.

unam sanctam was a papal bull which, by every standard in a brief search of the interwebs, is ex cathedra and infallible. The document itself is prefaced in part:

"The statements concerning the relations between the spiritual and the secular power are of a purely historical character, so far as they do not refer to the nature of the spiritual power, and are based on the actual conditions of medieval Europe. 'Unam' is frequently quoted, and misquoted, by anti-Catholics trying to prove that Boniface VIII, and Popes in general, are arrogant and evil men, intent on extending their own power."

seriously people. remember innocent iii? just misquoted. the borgias? well, it's hard to misquote a slit throat, but you've definitely misinterpreted them. i have no problem with the brothers and sisters in the Roman Catholic church. what i have a problem with is a man telling me i am going to hell unless i believe him to be the sole arbiter of the Word of God. that's called a Mediator, and i already have One.