The Orthodox tradition asserted that the character and rights of the church were fully present in each local community of Orthodox believers with its own bishop. All bishops were equal, and patriarchs or synods of bishops exercised only an "oversight of care" among the body of coequal bishops. The precedence of honor of individual national churches depended on historical rank. Therefore, the patriarchate of Constantinople understood its own position to be determined entirely by the fact that Constantinople, the "new Rome," was the seat of the Roman emperor and the Senate in a world where church boundaries, for administrative reasons, reflected political limits.
Apart from the different understandings of the personality of church power, the most significant doctrinal difference between Eastern and Western Christians arose over the exact wording of the Nicene Creed. The Orthodox churches demanded that no words be added to or taken away from the ancient and fundamental statement of the faith, as issued by the councils of Nicaea and Constantinople in the 4th century. During the early Middle Ages the Latin word filioque, meaning "and from the Son," was added in the Latin Christian world, thus rendering the creed as "I believe