The Catholic Church, also known as the Roman Catholic Church, is the largest Christian church and the largest religious denomination, with approximately 1.3 billion baptised Catholics worldwide as of 2019. As the world's oldest and largest continuously functioning international institution, it has played a prominent role in the history and development of Western civilisation. The church consists of 24 particular churches and almost 3,500 dioceses and eparchies around the world. The pope, who is the Bishop of Rome, is the chief pastor of the church. The bishopric of Rome, known as the Holy See, is the central governing authority of the church. The administrative body of the Holy See, the Roman Curia, has its principal offices in Vatican City, a small enclave of Rome, of which the pope is he