From the above posts we can see that the Papal priveleges of Rome were granted to them by the canons of the church NOT thru divine right as they claim today. This is best illustrated in canon 3 of the Council of Sardica:
"If two bishops of the same province have a discussion, neither of them shall choose as umpire a bishop of another province. If a bishop who has been condemned is so certain of his being right, that he is willing to be judged again in council- Let us honor, if you find it well to do so , the memory of the Apostle St. Peter; Let those who have examined the cause write to JULIUS bishop of Rome, if he think well that the case have a rehearing, let him designate the judges; if he think there be no neccesity for reviewing, his descision shall be final."
A few points that need to be pointed out on the above canon. The bishop of Rome, if he finds a reason for a new hearing, he can only appoint the bishops that will preside over a new council to hear the case, he was not granted authority to pass judgemnt on it.
That this privelege was granted to Rome by the sardica council only as a way to honor St Peter (another-words this privelege did not exist before the passing of this canon). This privelege is not an ancient custom, in fact it has a statute of limitation! According to the canon it should only be in effect during the life of Pope Julius! The canon specifically states to write to Julius bishop of Rome, thus upon his death this temporary canon dies wth him.
As already stated above canon 28 of Chalcedon gave these same priveleges to Constantinople. Rome rejected this canon but was still recieved by the entire ekklesia despite of Rome's protest. In fact Pope Leo lamented to the Emperess Pulcheria that since a year has lapsed since he "annulled" canon 28, the Illyrian bishops have fully accepted it. Another words the bishop of Rome would try to exhalt his See using hollow words, that the church would simply ignore.
As canon 28 gave priveleges to Constantinople, which first was granted to Rome alone, it did not grant to Constantinople priveleges that the other patriarchates already had. The privelege of calculating Pascha goes to Alexandria, Jerusalem was given in an ecumenical council the title of "Mother of all the Churches", a title no other church can claim. Canon 28 did grant Constantinople the right to call itself ecumenical (universal) a title first bestowed upon Rome in an ecumenical council.