The pope (Latin: papa from Greek: πάππας pappas, a child's word for "father"), also known as the supreme pontiff (from Latin pontifex maximus "greatest priest"), is the Bishop of Rome and therefore ex officio the leader of the worldwide Catholic Church. The primacy of the Roman bishop is largely derived from his role as the apostolic successor to Saint Peter, to whom Jesus is said to have given the Keys of Heaven and the powers of "binding and loosing", naming him as the "rock" upon which the church would be built. Since the 1860s, the pope has also been head of state of Vatican City, a city-state entirely enclaved within Rome, Italy. The current pope is Francis, who was elected on 13 March 2013, succeeding Benedict XVI.
The office of the pope is the papacy. His ecclesiastical jurisdiction, the Diocese of Rome, is often called the "Holy See" or the "Apostolic See", the latter name being based on the belief that the Bishop of Rome is the apostolic successor to Saint Peter. The pope is considered one of the world's most powerful people because of his extensive diplomatic and cultural influence.