One of the primary causes of the Great rift between the Western Church and the Eastern Church occurred because of the Nicene Creed, the Confession of Faith, the Filioque. This has been the subject of great controversy between Eastern and Western Christianity.
It is a term that refers to the Son, Jesus Christ, as an additional origin point of the Holy Spirit. besides the Father. It is not in the original text of the Creed, attributed to the First Council of Constantinople (381), which says that the Holy Spirit proceeds "from the Father", without additions of any kind, such as "and the Son" or "alone".
In the late 6th century, some Latin Churches added the words "and from the Son" (Filioque) to the description of the procession of the Holy Spirit, in what many Eastern Orthodox Christians have at a later stage argued is a violation of the Council of Ephesus, since the words were not included in the text by either the First Council of Nicaea or that of Constantinople. This was incorporated into the liturgical practice of Rome in 1014, but was rejected by Eastern Christianity.