The word filioque in Latin means "and son." Basically, it is the claim that the Holy Spirit proceeds from the Father and Son. If I'm not mistaken, it was added to the Nicene Creed after Chalcedon, so when this doctrine was codified by the Western Church, the Oriental Orthodox Churches had already separated and were not involved in the resulting controversy. Defenders of the Filioque claim that the assertion that the Holy Spirit proceeds from both the Father and the Son is supported by the Bible (John 15:26) and Sts Athanasius and Cyril of Alexandria. Why does the Eastern Orthodox Church reject the Filioque? Does the Coptic Orthodox Church take the same position as the Eastern Orthodox?