the Orthodox church came about around 1054 AD, until then there were Catholics and heretics (within the Christian picture)...read up on the Eastern Schism!
Pope Leo had died, and the pretended excommunication of the Patriarch by the Pope’s legates was illegal and a usurpation. That heresy by the Latin church marked the withdrawal of the Latin church from the realm of virtue and truth.
Pope Paul VI recognized the error of the Latin Church when he nullified the illegal acts of the pretended representatives of the Latin Church of 1054, in conjunction with the Ecumenical Patriarch.