Excommunicated Humbert from the Eastern Church (Leo IX was already dead)2.
Began as a “commercial” venture to repay dept to Venetians by killing Muslims 3.
The Orthodox Church is not a Protestant Church at all.
It began as simple a geo-political region of the existing worldwide church (latin term "catholic" not to be confused with "Roman Catholic"). Non-Chalcedonians – Egypt, Syria, Armenia, Mesopotamia a.
Ultimately, the main differences between this and the Catholic church is the authority of Scripture superseding the authority of the Pope and Catholic Church (both of which hold no authority in the Lutheran Denomination), the absence of “Icons” (religious statues - often given a sort of “mediator” status whereby they can receive honor and prayers on behalf of the Saint they (the statues) represent.), Lutheran Ministers can marry, Salvation to the Lutheran is by Grace through Faith as opposed to Sacramental observation and adherence to Church authority.
Broke from the Catholic Church as a result of a sausage eating event that was scheduled during a “holy fast” decreed by the Catholic Church.
They come under heavy persecution and have had survive almost 1500 years of constant attack.
Even though, in Zurich there was reformation everywhere, still Blaurock, Grebel, and Manz could not understand how a baby could choose to be a member of a church when all it could do was cry, eat, and dirty its diapers.
At the council of Chalcedon, when the Western "Roman" church began to over reach its authority.
This little group of believers was wrongly accused of monophysitism (the Christology that claims that Jesus has one combined nature of God and man).
Were it not for a letter to Mohammed to "spare the Copts as they are your 'kin;" The Coptic Christians would have possibly been driven out or worse, wiped out.
But they survived and still exist today and are constantly in the news for all of the atrocities that the Muslim Brotherhood inflict upon them.