And so because of that, that delegation decides to excommunicate Serularius, the Patriarch of Constantinople, the leader of what is now the most important church in the East. Remember, the other significant centers of Christianity are now under Muslim rule. Well, in retaliation to that, Patriarch Serularius says, hey, you can't excommunicate me. In fact, I'm going to excommunicate you. And he excommunicates the delegation. Excommunication says, I am making you, I am saying you are no longer part of the church. Now, when all of these cross-excommunications are happening, many people probably view this as, hey, this is just a power struggle between folks, probably not a big deal.