It would appear Rome was the original first patriarchate and was later replaced with Constantinople.
What caused the separation of Rome from the other Orthodox Patriarchates? What we always hear is "in 1054 Rome separated from Orthodoxy". Why?
We seek the true facts, so if any clergy from Rome or the Orthodox Communion care to provide us information we are happy to learn more from both points of view.
Here are a couple points that may have played a part in the separation.
1. Called by the Emperor without the Knowledge of the pontiff.
2. At the time the first president was not in communion with the Roman Church.
3. Without any recourse to the first of all the Patriarchs the council passed a canon changing the order of the patriarchates, and setting the new see of Constantinople in a higher place than the other ancient patriarchates.
4. Before the third of the Ecumenical Synods was called to meet, Pope Celestine had already convicted Nestorius of heresy and deposed and excommunicated him.
Subsequently, when the Council was assembled, and before the papal legates had arrived, the Council met, treated Nestorius as in good standing, entirely ignoring the sentence already given by Rome, and having examined the case (after summoning him three times to appear) proceeded to sentence Nestorius.
The fifth of the Ecumenical Synods refused to receive any written doctrinal communications from Pope Vigilius, removed his name from the Diptychs, and refused him communion.
The sixth of the Ecumenical Synods excommunicated Pope Honorius, who had been dead for years.
It is certain the Pope had nothing to do with calling the Seventh Synod. Rome did accept the Seven Ecumenical Councils.
A claim by Rome was Jure Ecclesiastico which did not affect doctrine.
We ask - By their actions did those of the Orthodox Churches who acted as mentioned above act contrary to the canons in effect at that time? Were there actions proper? We question the acts of those who ignored the canons and acted against Rome. It would appear such actions occurred then and continue today.