Answer:
The Roman Empire
Step-by-step explanation:
The Great Schism was the break of communion between the Roman Catholic Church and the Eastern Orthodox Churches. Back when the Catholic Church had it's power concentrated on Rome and politics and religion were heavily mixed, there were political tensions between Rome and Constantinople brewing for several centuries. It all culminated in the separation of the two churches, with the Roman Catholic Church maintaining its influence over the Western Roman Empire and the Eastern Orthodox Church over the Eastern Roman Empire also known as the Byzantine Empire.