And the east, they said, no, we have agreed to use leavened bread. And so this is one further tension, even more than the actual issues, are the sense of, well, why do you think you have the right to tell me what to do? And as we get into 1053, you have what are known as the Latin churches in Constantinople being shut down by the Patriarch of Constantinople, Patriarch Serularius or Carularius, saying that, hey, these guys are going against what is actually acceptable in Christianity. Now, in retaliation, you have Pope Leo IX shutting down what would be known as Greek churches and how they practice in the Italian Peninsula, either closing them down or forcing them to practice the way the Latins practice. Now, there's a whole complicated series of events as we go into 1053 and 1054. Letters are sent back and forth. Eventually, Pope Leo IX sends a delegation to Constantinople. Part of it is to see if they can coordinate against Norman conquerors on the Italian Peninsula, but part of it is also to make clear what Pope Leo IX believes, that, hey, you have no right to criticize us about this unleavened bread.