The Photian Schism was a significant conflict in the 9th century between the Eastern Orthodox Church and the Roman Catholic Church. It centered around the appointment of Photius as the Patriarch of Constantinople, which was contested by the Pope. This disagreement highlighted the growing tensions between the two branches of Christianity. The schism was marked by theological disputes and issues of authority, particularly regarding the role of the Pope. It contributed to the eventual division between the Eastern and Western Churches, setting the stage for further conflicts, including the later Great Schism of 1054.