Pope Gelasius I enunciates the proper relationship between the Pope of Rome and the Emperor and the proper relationship between the Pope of Rome and the Metropolitan Bishop of Constantinople. Unfortunately for Gelasius, the Emperor and Bishop of Constantinople have a different understanding.

After the death of Gelasius, Pope Anastasius II strives to ease tensions with the East, to disastrous results.

Links:
The Christ between St. Peter and the Emperor

Letter of Gelasius to Emperor Anastasius I enunciating two powers doctrine

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#480 – A History of the Catholic Church – The Gelasian Doctrine