The Orthodox Church was founded by Jesus Christ and his apostles on the day of Pentecost with the descent of the Holy Spirit in the year 33 A.D.
Also known (especially in the West) as the Eastern Orthodox Church or the Greek Orthodox Church, it may also be called the Orthodox Catholic Church, the Orthodox Christian Church, the one, holy, catholic and apostolic Church, the Body of Christ, the Bride of Christ or simply the Church.
The bishops of the various Orthodox Church branches trace unbroken succession to the holy apostles, therefore ultimately receiving their consecrations from our Lord Jesus Christ. All bishops of the Eastern Orthodox Church, regardless of their titles, are equal in their sacramental office.
The faith held by the Church was handed down by Jesus Christ to the apostles and their successors throughout the centuries. Nothing is added or subtracted from that deposit of faith which was handed once and for all to the saints (Jude 3). The primary statement of faith is expressed in the Nicene-Constantinopolitan Creed and in the teachings of the Ecumenical Councils.