Bardas was denied the regent's crown because of a pesky little problem with incest.Bardas did what a Byzantine emperor always did when confronted with this problem.He deposed and exiled the patriarch (Ignatius) and had him replaced.Enter Photius,whom the Pope refused to recognize(excommunicated him).After a decade of futile negotiations,Photius retaliated by calling a synod at Constantinople in 867,at which he declared he was excommunicating the Pope and the Western Church.He cited the tired old grounds of the West's fasting on Saturday,dating Lent differently,encouraging a celibate priesthood,reserving the power of confermation to bishops rather than priests,and for holding to the idea that the Holy Spirit was transmitted by both the Father and the Son. This last point would be known as the filioque controversy and was to provide the most important theological split between the East and West.What is particularly odd about the filioque is the nature of the dispute.That the Holy Spirit came from both the Father and the Son was traditional Christian belief,a part of Trinitarian orthodoxy upheld against every Eastern variation of the heretical Monophysites.What mad it controversial was its insertion by the Roman Church into the Nicene Creed in order to make this point clear to the newly converted tribes of the West,some of whom had been Arians and unsteady in their own understanding of the Trinity.Even in Rome,this insertion was controversial,as it meant a change in the established formula.It was accepted,however,because it clarified Church doctrine,rather than altered it.
But Photius used the insertion of the filioque as an unlikely stick with which to beat an unlikely source,Rome and the Western church,with an unlikely crime:heresy.Rousing Byzantine nationalism against Rome suddenly made the filioque a national and imperial cause in the East.Eastern bishops had been trained for centuries in affirming heretical innovations.This time they condemed Rome for changing the Creed,but on grounds that shaded Eastern theology to Monophysitical and Arian views of Jesus-heresies,of course,that many Eastern clerics had eagerly embraced before.Bizarrely,it is this issue-as well as the denial of papal supremacy and other minor addenda-propounded by Photius,an illegally appointed patriarch defending an incestuous emperor,that divides the Eastern Orthodox and the Roman Catholic churches to this day. Taken from the book TRIUMPH by H.W. Crocker III