In 1054 when the Greek-speaking bishops of the East and the Latin-speaking bishops of the West excommunicated each other and their churches (so that the church became divided between Eastern Orthodoxy and Roman Catholicism) one of the issues dividing the two halves of Christendom was the Trinity and, most particularly, the insertion into the Latin form of the Nicene Creed of the phrase “and from the Son” (filioque).
