"I will give you the keys of the kingdom of heaven, and whatever you bind on Earth shall be bound in heaven, and whatever you loose on Earth shall be loosed in heaven." Jesus to Peter in the Gospel of Matthew, The crossed gold and silver keys of the Holy See symbolise the keys of Simon Peter, representing the power of the papal office to loose and bind.

The triple crown papal tiara symbolises the triple power of the Pope as "father of kings", "governor of the world" and "Vicar of Christ".

It is as head of the Holy See, not as head of Vatican City State, that the pope receives ambassadors of states and sends them his own diplomatic representatives.

The Holy See also confers orders, decorations and medals, such as the orders of chivalry in the Middle Ages.

His ecclesiastical jurisdiction is called the "Holy See" (Sancta Sedes in Latin), or the "Apostolic See" (meaning the see of the apostle Peter).

a small city-state entirely enclaved within the city of Rome, which is an entity distinct from the Holy See.

The Catholic Church has influenced Western philosophy, culture, science, and art.

The Catholic Church shared communion with the Eastern Orthodox Church until the East–West Schism in 1054, disputing particularly the authority of the Pope, as well as with the Oriental Orthodox churches prior to the Chalcedonian schism in 451 over differences in Christology.

While the famous Saint Peter's Basilica is located in Vatican City, above the traditional site of Saint Peter's tomb, the papal cathedral for the Diocese of Rome is Saint John Lateran, located within the city of Rome, though enjoying extraterritorial privileges accredited to the Holy See.

The position of cardinal is a rank of honour bestowed by popes on certain clergy, such as leaders within the Roman Curia, bishops serving in major cities and distinguished theologians.

Its teaching includes sanctification through faith and evangelisation of the Gospel and Catholic social teaching, which emphasises support for the sick, the poor, and the afflicted through the corporal and spiritual works of mercy.