A really good example of #6!.. Begging the Question - Assuming the thing to be true that you are trying to prove. It is circular.
..The only Divine evidence to us of what was primitive is the witness and voice of the Church at this hour. (Manning)
Thus the fact that the Church teaches Tradition, Scripture and history support as being assuredly infallible is a guarantee that it is true.
Oddly enough, the mutual excommunication of 1054 was partly due to one of the significant forgeries (among others) Rome used to assert her supremacy, that of the Donation of Constantine, fabricated somewhere between the years 750 and 850, and often cited during during the Middle Ages in support of the Roman Church's claims to spiritual and temporal authority (and later exposed as a forgery by a humanist Italian Catholic priest and others in the early 1400s, though its authenticity was occasionally defended till about 1600.)
In 1054, Pope Leo IX sent a letter to Michael Cærularius, Patriarch of Constantinople, that cited a large portion of the forgery called the Donation of Constantine, believing it genuine.[56] The official status of this letter is acknowledged in the 1913 Catholic Encyclopedia, Volume 5, entry on Donation of Constantine.[57]
"The first pope who used it in an official act and relied upon it was Leo IX; in a letter of 1054 to Michael Cærularius, Patriarch of Constantinople, he cites the "Donatio" to show that the Holy See possessed both an earthly and a heavenly imperium, the royal priesthood."[58]
Leo IX assured the Patriarch that the donation was completely genuine, not a fable or old wives' tale, so only the apostolic successor to Peter possessed that primacy and was the rightful head of all the Church. The Patriarch rejected the claims of papal primacy, and subsequently the Catholic Church was split in two in the Great East-West Schism of 1054. http://en.wikipedia.org/wiki/East%E2%80%93West_Schism#Mutual_excommunication_of_1054
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