Coptic Orthodox Church, Alexandria

There is a period in the history of Egypt during which the old beliefs are denied and Islam has not yet entered. Egypt was then a Christian state. One of the ancient Eastern Monophysite churches, the Coptic Orthodox Church, was founded in Alexandria in 536-580 by the Egyptian Copts, and according to ancient tradition, the founder was the evangelist Mark.
This church goes through many vicissitudes in order to be accepted and established. At the Ecumenical Council of Chalcedon, the representatives of the Coptic Orthodox Church did not accept his decisions, and she was declared heretical because she followed Monophysitism. This led to the Byzantine oppression of the Coptic Orthodox Church, and later, after the Arab invasion, it experienced forced Islamization, which led to a significant decline. In the 19th century, Coptic Patriarch Cyril IV began negotiations for the accession of Coptic Christians to the Orthodox Church, but was poisoned, and his opponents entered into a union with Rome in 1898.
About 400 municipalities, subordinate to 32 dioceses, of which 28 are in Egypt, 2 in Sudan and 1 each in Kenya and Israel, are part of the Coptic Orthodox Church. The temples of the Coptic Church are square. They have their own church calendar, and the chronology begins in 284. 
The Coptic Church is headed by a spiritual leader, who is titled Pope and Patriarch of Alexandria, His Holiness Shenouda III. Theologian and Cyril of Alexandria, where he was born with the Orthodox Church.
The Coptic Church preserved some Jewish (early Christian) rites, such as circumcision. Another characteristic feature of the Copts is that their baptism includes a tattoo in the form of a cross.