Name one Pope who taught heresy.
OK, thanks for asking. It wasn't me who said so it was an ecumenical church council.
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You didn't use an approved "Catholic Apologist" site. How can anyone trust what "Protestants" say.
For an interesting read go to the Catholic Encyclopedia.
Pope Honorius I
Pope (625-12 October, 638), a Campanian, consecrated 27 October (Duchesne) or 3 November (Jaffé, Mann), in succession to Boniface V
His chief notoriety has come to him from the fact that he was condemned as a heretic by the sixth general council (680). . . .
On the other hand the chief advocates of papal infallibility, for instance, such great men as Melchior Canus in the sixteenth century, Thomassinus in the seventeenth, Pietro Ballerini in the eighteenth, Cardinal Perrone in the nineteenth, have been careful to point out that Honorius did not define anything ex cathedra.
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The entire article is a good read:
Pope Honorius I> ------------------------------------------------------------
I
love the Catholic Encyclopedia. It is a fine example of a publication torn between the need of historical accuracy and, yet defending sometimes untenable positions .