I’m surprised you don’t know about this
See the discourse
HERE between Peter of Antioch and Michael Cerularius
Cerularius was a schismatic from the beginning and his whole goal was to sever communion with Rome. As with his acts of closing down all the Latin churches in Constantinople ; historian J. B. Bury, notes that Cerularius’ purpose in closing the Latin churches was
“to cut short any attempt at conciliation”.
Incorrect , I will highlight the ones he was actually guilty of and the blue are charges that arose from differences of tradition :
"Because like Simoniacs, they sell the gift of God;
Like Valesians, they castrate their guests and promote them not only to the clergy but to the episcopacy;
Like Arians, they rebaptize those already baptized in the name of the Holy Trinity, and especially Latins;
Like Donatists, they claim that with the exception of the Greek Church, the Church of Christ and baptism has perished from the world;
Like Nicolaitists, they allow and defend the carnal marriages of the ministers of the sacred altar;
Like Severians, they say that the law of Moses is accursed;
Like Pneumatomachoi or Theomachoi, they cut off the procession of the Holy Spirit from the Son;
Like the Manichaeans among others, they state that leave is ensouled (animatum);
Like the Nazarenes, they preserve the carnal cleanness of the Jews to such an extent that they refuse to baptize dying babies before eight days after birth and, in refusing to communicate with pregnant or menstruating women, they forbid them to be baptized if they are pagan;
And because they grow the hair on their head and beards, they will not receive in communion those who tonsure their hair and shave their beards following the decreed practice of the Roman Church.
Furthermore, when we, the Pope’s ambassadors, wanted to eliminate the causes of such great evils in a reasonable way,
he denied us his presence and conversation, forbid churches to celebrate Mass, just as he had earlier closed the churches of the Latins and, calling them “azymites,” had persecuted the Latins everywhere in word and deed. Indeed, so much [did he persecute them] that among his own children, he had anathematized the apostolic see and against it he still writes that he is the ecumenical patriarch.
Therefore, because we did not tolerate this unheard of outrage and injury of the first, holy, and apostolic see and were concerned that the catholic faith would be undermined in many ways, by the authority of the holy and individuated Trinity and the apostolic see, whose embassy we are performing, and of all the orthodox fathers from the seven councils and of the entire catholic Church, we thus subscribe to the following anathema which the most reverend pope has proclaimed upon Michael and his followers unless they should repent.
Michael, neophyte patriarch through abuse of office, who took on the monastic habit out of fear of men alone and is now accused by many of the worst of crimes; and with him Leo called bishop of Achrida; Constantine, chaplain of this Michael,
; and all their followers in the aforementioned errors and acts of presumption: Let them be anathema Maranatha with the Simoniacs, Valesians, Arians, Donatists, Nicolaitists, Severians, Pneumatomachoi, Manichaeans, Nazarenes, and all the heretics — nay, with the devil himself and his angels, unless they should repent. AMEN, AMEN, AMEN.
Rome’s break with communion didn’t happen overnight, but they did slowly estrange themselves from the rest of the Eastern sees.
No actually Rome tried to maintain , and successfully did for a time, communion with the other eastern sees until they broke communion and stopped commemorating Rome. Russia up to the 12th century still sought blessing from the Pope of Rome for their king for example. Further after the eastern sees broke from Rome , Rome sent, on numerous occasions, envoys to Constantinople to try and secure union of the churches finally culminating in the second Council of Lyons.
Rome was actually shocked to find that a few decades before the mutual excommunication of 1054, that Constantinople stopped commemorating Rome in its diptychs
