Pope applies to jurisdiction Catholic Church
Bishop of Rome, Vicar of Jesus Christ, Successor of the Prince of the Apostles, Supreme Pontiff of the Universal Church, Primate of Italy, Archbishop and Metropolitan of the Roman Province, Sovereign of the Vatican City State, Servant of the servants of God.
The best-known title, that of "pope", does not appear in the official list, but is commonly used in the titles of documents, and appears, in abbreviated form, in their signatures. Thus Paul VI signed as "Paulus PP. VI", the "PP." standing for "papa pontifex" ("pope and pontiff").The title "pope" was from the early 3rd century an honorific designation used for any bishop in the West. In the East, it was used only for the bishop of Alexandria. Marcellinus (d. 304) is the first bishop of Rome shown in sources to have had the title "pope" used of him. From the 6th century, the imperial chancery of Constantinople normally reserved this designation for the bishop of Rome. From the early 6th century, it began to be confined in the West to the bishop of Rome, a practice that was firmly in place by the 11th century.In Eastern Christianity, where the title "pope" is used also of the bishop of Alexandria, the bishop of Rome is often referred to as the "pope of Rome", regardless of whether the speaker or writer is in communion with Rome or not.