Pope Felix III dies. Because of his harsh response to and efforts to suppress the Monophysite heresy that had taken hold in the eastern Church, he damaged relations between Rome and Constantiononople.
Pope Felix III will went so far as to excommunicate the patriarch of Constantinople, Acacius, for appointing a Monophysite bishop to the see of Antioch to replace an orthodox bishop. Acacius, though, just ignored Pope Felix III.
Pope Felix III was rather authoritarian and uncompromising, especially with regards to heresy. He is sometimes quoted as having said:
"Not to oppose error is to approve it; and not to defend truth is to suppress it, and, indeed, to neglect to confound evil men—when we can do it—is no less a sin than to encourage them."