Without ever mentioning the Franks, the Eighth Ecumenical Synod of 879 condemned those who either added or subtracted from the Nicene-Constantinopolitan Creed, and also those who had not yet accepted the Seventh Ecumenical Synod. It must first be emphasized that this is the first instance in history wherein and Ecumenical Synod condemned heretics without naming them. In this case, the heretics are clearly the Franks.
Fr. John Romanides