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Orthodox Christianity refers to the branch of Christianity that follows the teachings and traditions of the early Christian Church as established by the apostles. It is characterized by its adherence to the Nicene Creed, the authority of the seven Ecumenical Councils, the veneration of saints, and the use of icons in worship. Orthodox Christians believe in the Holy Trinity, the divinity of Jesus Christ, and the importance of sacraments in achieving salvation. The Orthodox Church is organized into autocephalous (self-governing) churches, each led by a patriarch or metropolitan, with the Ecumenical Patriarch of Constantinople considered the "first among equals." Worship in the Orthodox tradition is characterized by a rich liturgical tradition, including elaborate ceremonies, fasting periods, and a calendar of feast days celebrating important events in the life of Christ and the saints.