Eastern Orthodoxy is one of the oldest branches of Christianity, tracing its roots back to the early Christian communities established by the apostles. It is characterized by its adherence to the traditions and teachings of the Seven Ecumenical Councils and emphasizes the importance of the Holy Scriptures and the Sacraments. The Orthodox Church is organized into various national churches, each led by a Patriarch or Metropolitan, with the Ecumenical Patriarch of Constantinople considered the "first among equals." The worship in Eastern Orthodoxy is rich in rituals and symbolism, often featuring elaborate liturgies and the use of icons. The faithful participate in the Divine Liturgy, which is the central act of worship, and the church calendar is filled