- It was the break up of the Church into two parts = Western Catholic Church and Eastern Orthodox Church. - Political cause = the splitting of the Roman Empire to west and east - Linguistic cause = In the West, they spoke Latin meanwhile in the East they spoke Greek - The Eastern Orthodox Church disagreed on the changes that the Roman Catholic Church made on the Nicene Creed (statement of faith) - Roman Catholic Church = "We believe in the Holy Spirit, the Lord, the giver of life, who proceeds from the Father and the Son," - Eastern Orthodox Church = "We believe in the Holy Spirit, the Lord, the giver of life, who proceeds from the Father," - They disagreed with "and the Son" because they believed it was non-canonical (not relevant) - They also had disagreements when discussing over who the Balkan area belonged to