The pope (Latin: papa from Greek: πάππας pappas, "father"), also known as the supreme pontiff (from Latin pontifex maximus "greatest priest"), is the Bishop of Rome and ex officio leader of the worldwide Catholic Church. Since 1929, 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.
While his office is called the papacy, the episcopal see and ecclesiastical jurisdiction is called the Holy See. It is the Holy See that is the sovereign entity of international law headquartered in the distinctively independent Vatican City State, established by the Lateran Treaty in 1929 between Italy and the Holy See to ensure its temporal, diplomatic, and spiritual independence. The primacy of the Bishop of Rome is largely derived from his role as the apostolic successor to Saint Peter, to whom primacy was conferred by Jesus, giving him the Keys of Heaven and the powers of "binding and loosing", naming him as the "rock" upon which the church would be built.