Because the popes wanted independence from the emperor. The Byzantines controlled central Italy and Rome. Relations with the emperor were tense. The Bishops of Rome had gained quite a lot of autonomy, but they wanted full independence. They also wanted the independence of Roman Catholic Europe from the Byzantine Empire whose state religion was Orthodox Christianity.
the pope and the emperor disagreed on who controlled a certain part of Rome, so the pope eventually banished the emperor from the church.
The Byzantine army supported the emperor. There was a schism between the Catholic and Orthodox churches in the eleventh century. From that time onward the emperor was seen as the head of the Orthodox church, and the Pope as the head of the Catholic church.
Pope Urban II agreed to help Byzantine Emperor Alexius I because he wanted to unite the Christian church and support the Byzantine Empire against Muslim invaders during the First Crusade.
The Byzantine Emperor (Alexius) asked Pope Urban for Christian knights to help him fight the Muslims Turks.
In the Orthodox the emperor claims authority over all religious leaders. And in the Roman Catholic the pope claims authority over all kings and emperors.
The Pope excommunicated the Byzantine Emperor Michael I Cerularius in 1054 due to a disagreement over the use of unleavened bread in the Eucharist. This dispute symbolized deeper theological and cultural rifts between the Eastern Orthodox and Roman Catholic Churches. The conflict over liturgical practices highlighted the growing estrangement that ultimately contributed to the Great Schism, dividing Christianity into Eastern and Western branches.
to get protection by muslims
Byzantine Emperor
Byzantine Emperor
Byzantine Emperor
In the Roman Catholic Church, the patriarchs are not directly appointed by the emperor. The appointment of patriarchs is typically made by the Pope, who is the supreme authority in the Church. Historically, the relationship between the Church and state varied, especially in the Byzantine Empire, where the emperor had significant influence over ecclesiastical matters, but in the modern Catholic Church, the Pope holds the ultimate authority in appointing patriarchs.
The pope is western. The Byzantine Church is eastern.