You have the Byzantine emperor seated in Constantinople. You have the Bishop of Rome, now known as the Pope, really the Pope of Rome, who considers themselves more and more the leader of all of Christianity, and their argument there is, look, this is the church that, according to tradition, was founded by Peter, first amongst the apostles. You have the Patriarch of Constantinople, and patriarchs of other significant centers of Christianity say, wait, hold on a second. Yes, Bishop of Rome, you are very important, but we consider you to be first amongst equals. You don't have jurisdiction over all of Christendom. Together, we have jurisdiction. And this was, to some degree, the case under Justinian, and it was very clear at this time that the Byzantine emperor was very powerful, not just over the temporal realm, really referring to the day-to-day material realm, but also a lot of influence on the spiritual realm, which was really supposed to be the domain of the bishops or the popes or the patriarchs.