The conclave to elect Pope Francis’s successor will begin on 7 May, the Vatican has announced.
Some 135 cardinal electors – those under the age of 80 – will take part and vote for the new pontiff.
The rituals of the event, held in the Sistine Chapel, are elaborate and date back centuries. So how does the process work?
When Pope Francis died, the Catholic Church entered a period known as “sede vacante”, meaning “empty seat”.
His ring and seal – used to dispatch papal documents – were broken to prevent anyone else from using them.
Cardinal Kevin Farrell – the Camerlengo, or chamberlain, who announced Francis’s death – became the interim chief of the Catholic Church.
The conclave
Cardinals travel to Rome from all over the world and stay until a new pope is chosen.
Of the 252 current ones, there are 135 cardinal electors: 53 from Europe; 23 from Asia; 20 from North America; 18 from Africa; 17 from South America; and four from Oceania.
Italy has the most cardinals who can vote, with 17, while the US has 10 and Brazil has seven. The UK has three.
Once the conclave begins, the cardinals will not emerge from the Vatican until a new pope has been chosen. The word “conclave” comes from Latin, meaning “with key” – a reference to the isolation in which the cardinals are kept.
While holding voting sessions in the Sistine Chapel, they sleep in the Casa Santa Marta – a guesthouse inside the Vatican’s grounds.
The longest conclave lasted almost three years, between 1268 and 1271. Several have lasted only one day. The one which elected Pope John Paul in 1978 lasted less than three days. Cardinals chose Pope Francis in around two days.
While the conclave is ongoing, cardinals are unable to communicate with the outside world. No telephones, internet use or newspapers are allowed.
Except for the first day, when only one ballot is held, the cardinals hold two daily votes until one candidate has a majority of two-thirds plus one. They are sworn to secrecy about the voting.
White smoke?
So how do we know if a decision has been reached? Yes, this is the black smoke, white smoke part.
If the cardinals have not reached a majority, the cards and the tally sheets are placed in a stove and burned with an additive to produce black smoke, showing the outside world that a pope has not yet been chosen.
Watching for the tell-tale smoke arising from the top of the Sistine Chapel is a tradition, with Catholics crowding into St Peter’s Square for the spectacle.
If no result has been reached after three days, the sessions are suspended for a day to allow for prayer and discussion. More ballots are held until a two-thirds majority is reached.
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When enough cardinals have agreed on a candidate, he is asked if he accepts the papacy and by which name he wishes to be known.
The ballots are burned as before, but with an additive to produce white smoke.
New pope proclaimed
The new pope then dons his new papal vestments – tailors keep large, medium and small sizes ready – and sits on a throne in the Sistine Chapel to receive the other cardinals who file up to pay homage and swear obedience to the church’s new leader.
The senior cardinal deacon then steps out on to the central balcony of St Peter’s Basilica overlooking the square and announces in Latin: “Annuntio vobis gaudium magnum. Habemus Papam” (I announce to you a great joy. We have a pope) and reveals the cardinal’s name and the name he has chosen.
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The new pope then appears on the balcony to deliver his first public pontifical greeting and bless the crowds in St Peter’s Square.
A few days later, he celebrates a mass that marks the beginning of his papal ministry.
