What is the cause of the struggle between the Catholic and Orthodox Churches do you know?

In the ninth century, controversy was caused by the election of a patriarch named Photius. The question arose about the legality of the election, but this was only a pretext. In fact, the pope wanted to spread his influence in the Balkan Peninsula.

A dispute arose between the ruling circles of the Orthodox and Catholic Churches over the interpretation of the symbol of faith.

There were a number of contradictions between Rome and Byzantium, which included: issues of ritualism, primacy and supremacy, sphere of influence.

Both sides wanted to concentrate all influence in their own hands.