Here’s the rest,
Also read Dr. Philip Blosser:
My hunch is that such misinformation [the Orthodox opinion that Rome got it wrong on the 8th ecumenical council] stems from the incestuous reliance of Anti-Western Orthodox writers exclusively on schalarship slanted to their cause, in this case, even reliance upon the otherwise excellent pioneering work of Francis Dvornic, which is highly problematic in certain respects, as well as those who have relied on his tendentious assumptions (such as Meijer, Phidas, Siamakis, etc.).
The ecumenical status of the Fourth Council of Constantinople of 869-870 has long been contested by the Anti-Western Orthodox. During the ecumenically-charged milieu leading up to and following the Second Vatican Council, many Roman Catholic scholars and ecumenists, eager to mend relations with their Eastern Orthodox brethren, have been back-pedaling and down-playing their former criticisms of Photius, amending and revising their accounts of the Photian Schism. In this process, some further details have been brought to light, but in some instances earlier details have been obfiscated and covered over. One of the most prominent Catholic scholars during this period has been Francis Dvornik (or Dvornic), whose books, The Photian Schism: History and Legend (Cambridge: Cambridge University Press, 1948; rpt. 1970) and Byzantium and the Roman Primacy (New York: Fordham University Press, 1966; rpt. 1979) have been viewed by Anti-Western Orthodox scholars as having come a significant way towards accommodating some of their interpretations. To their delight, Dvornik accepts, for example, their claim that the belief that the successors of John VIII–Marinus I, Stephen V, and Formosus–had broken with Photius is a legendary invention. It must be conceded, in fact, that Photius did die in communion with Rome. Dvornik’s claim that Photius never actually questioned Roman primacy seems well-attested. However, the notion that the ecumenical status of the Fourth Council of Constantinople in 869-870 is fundamentally compromised by the acts of the Photian Council of 879-880 cannot be seriously maintained. First, the matter is ultimately a question of authority, and whether the matter was immediately settled in the ninth century or not is in the final analysis irrelevant. Second, the Council claimed for itself an ecumenical status by calling itself the universalis octava synodus; and it had at least the necessary geographical characteristics because of the authority of all the heads of the Church who were either present or represented.
Was it recognized as ecumenical by the Holy See? Three facts are certain and incontestable. First, Adrian II had already approved it in his letter of Nov. 10, 871, as well as in his letter to the faithful of Salerno and Amalfi in 875; and John VIII called it sancta octava synodus, thereby formally recognizing its ecumenical status. Second, the Council has been listed among the ecumenical councils recognized by the Roman Catholic Church since the beginning of the 12th century. Third, the Byzantine Church itself accepted the Council as ecumenical until the Photian Synod of 879-880, which is thought to have abrogated its Acts; and those portions of the Byzantine Church that reunited with Rome since that time have considered it as ecumenical.
The crux of debate is reducible to the question whether Pope John VIII, by means of his supreme power of binding and loosing, actually annulled the acts of the Council of 869-870, thus depriving it of ecumenical status. This is of course what is claimed by Anti-Western Orthodox scholars, who have a curious (if convenient) interest at this point in the Roman primacy of John VIII. The answer is affirmative if the Greek text of the last two sessions of the Photian Synod are considered authentic, which may be doubted, not least because of Photius’s history of altering the letters sent to him, to the Emperor Basil, and to the Byzantine Church by Pope John VIII, before having them read at the Photian Synod of 879-880. The answer is negative if takes into consideration other documents, such as the letter of Pope Stephen V to Emperor Basil I in 885-886. This letter states, in fact, that 20 years after the Fourth Council of Constantinople (869-870), Photius was still trying to have it annulled, a step that would be inexplicable if prior to this time John VIII had already taken the initiative in this matter.
While ecumenically-minded scholars such as Dvornik have written irenically in support of the thesis of abrogation by John VIII, others such as Venance Grumel and Martin Jugie have defended the thesis of non-abrogation and ecumenicity of the Fourth Council of Constantinople (869-870) as the Eighth Ecumenical Council of the Church. Ultimately, however, the issue is one of ecclesiastical authority, in testimony of which stands the record of decrees of the Holy See.[/list]
Also read this important review of Fr. Dvornik work by another Catholic historian, Fr. Venance Grumel (Catholic). While commending Fr. Dvornik’s work, Fr. Grumel highlight some flaws.