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The Orthodox Church of Byzantines persecuted Christians that did not agree with official Church dogma. For example the Christian sect of Paulicians, known as Bogomils, Patarens or Babuns, etc. in Balkans. A sectar priest, called Basil was burned during Alexios Comnen, Roman Emperor.
The sect spred mainly in Macedonia (known as Bulgaria themata). From this, through the Vlachs, Bogomilism arrived in Serbia, Bosnia, Dalmatia and Croatia. As a proof, there are the Vlach tombstones called stecci by Slavs. The tombstones have no cross, according to Bogomil ideology. Tombstones are spread from top of the mountains to plains, along the transhumance paths of Vlachs. Marian Wenzel studied the tombstones and demonstrated their Vlach origin.
After Roman emperors, all orthodox churches started a campaign against Bogomil. The rulers of Serbia and Hungary started legislative and military actions against Bogomils. As a result, a part of Bogomils were reconverted to Orthodoxy but many practiced Bogomil faith in secret. Excepting Bosnia, Bogomilism was eradicated in Balkans around the 14th century.