 Humbert quickly disposed of negotiations by delivering a bull excommunicating the Patriarch.This act, although legally invalid due to the pope's death at the time, was answered by the patriarch's own bull of excommunication against Humbert and his associates and is popularly considered the official split between the Eastern and Western Churches.The patriarch rejected the claims of papal primacy, and subsequently the Church was split in two in the Great East–West Schism of 1054.