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The Pope is an official, or at least an agent of some sort, of the Eastern Roman Emperor of Constantinople. This is backed up by the fact that the Eastern Emperor would promulgate a Church council, pushing the canons it created into law, not with the approval of the Pope himself.
The Pope violates the principal of the Roman and Constantinopolitan Patriarchs being equal in power in the Christian world. This canon (Canon 28, Council of Chalcedon) was promulgated along with the other canons by Emperor Marcian four times during Feburary 452 while Pope Leo I gave his rejection over this canon a year later on March 21, 453. However, he no longer possessed the authority he enjoyed over all other Patriarchs at this time because the canons came into law before.
Am I on to something?