Answer :
After being excommunicated, Patriarch Michael Cerularius' excommunicated the representative and the Pope himself.
In 1054 AD, there was tension between Pope Leo IX and the Patriarch of Constantinople, Michael Celularius, about the imperial power over the Church. According to Cerularius, the Emperor of the Byzantine Empire had sovereignty over Church in Rome. Moreover, he considered that as the Patriarch of Constantinople, he was equal in authority to the Pope. He forbid Latin Churches to celebrate mass in Latin and wanted to impose the Greek liturgy.
Pope Leo IX sent a commission of cardinals to negotiate with Cerularius. However, during negotiations, the Pope died. The cardinals decided to proceed with their mission, and excommunicated the Patriarch of Constantinople and his followers.
In response to the commission from Rome, Michael Cerularius excommunicated the cardinals.
These events led to the East-West Schism and to the end of the alliance between the Popes and Byzantine emperors.
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