Hey, Pope Gregory said it --- not me

Pope Gregory I
as the UNIVERSAL BISHOP
also known as the office of the PAPACY

Pope Gregory I (Pope 590-604) said, in reference to Bishop John of the east, "I say confidently, therefore, that whosoever calls himself universal bishop, or even desires in his pride to be called such, is the forerunner of antichrist." Christ and Antichrist p.12 S.J. Cassels

"The preaching of the Catholic faith and the elimination of all deviations from it was a key element in Gregory's worldview, and it constituted one of the major continuing policies of his pontificate."

Wikipedia

...and as ye have heard that antichrist shall come,

even now are there many antichrists;

whereby we know that it is the last time.

1 John 2:18