The Catholic Church, also known as the Roman Catholic Church, is the largest Christian church, with more than 1.29 billion members worldwide. As one of the oldest religious institutions in the world, it has played a prominent role in the history and development of Western civilisation. Headed by the Bishop of Rome, known as the Pope, the church's doctrines are summarised in the Nicene Creed. Its central administration, the Holy See, is in the Vatican City, an enclave within Rome, Italy.
The Catholic Church teaches that it is the One, Holy, Catholic and Apostolic church founded by Jesus Christ, that its bishops are the successors of Christ 's apostles, and that the Pope is the successor to Saint Peter to whom primacy was conferred by Jesus Christ. It maintains that it practises the original Christian faith, reserving infallibility, passed down by sacred tradition. The Latin Church, the Eastern Catholic Churches, and institutes such as mendicant orders and enclosed monastic orders reflect a variety of theological and spiritual emphases in the church.
Of its seven sacraments the Eucharist is the principal one, celebrated liturgically in the Mass. The church teaches that through consecration by a priest the sacrificial bread and wine become the body and blood of Christ. The Virgin Mary is venerated in the Catholic Church as Mother of God and Queen of Heaven, honoured in dogmas and devotions.
