With the death of Pope Francis, announced by the Vatican on Monday (April 21), the Roman Catholic Church will begin elaborate rituals steeped in tradition that mark the end of one papacy and lead to the start of the next.

Most are governed by a constitution known as Universi Dominici Gregis (Of the Lord's Whole Flock) approved by Pope John Paul II in 1996 and revised by Pope Benedict XVI in 2007 and 2013.

A cardinal known as the camerlengo (chamberlain), currently Irish-American Cardinal Kevin Farrell, will run the ordinary affairs of the nearly 1.4 billion-member Roman Catholic Church during the period known as the "sede vacante" (empty chair).

READ: Tens of thousands say goodbye to Pope Francis lying in state

He officially confirms the pope's death, a simple matter these days involving a doctor and a death certificate. Until sometime in the 20th century, this was ritually done by tapping a silver hammer on the pope's forehead three times.

The camerlengo and three assistants chosen from among cardinals under 80 years of age, known as cardinal electors, decide when the pope's body is to be taken into St. Peter's Basilica for the public to pay their respects.

They also make sure the pope's "Fisherman's Ring" and his lead seal are broken so they cannot be used by anyone else. No autopsy is performed.

The camerlengo locks and seals the pope's personal residence. In the past, this was in apartments in the Apostolic Palace but Francis lived in a small suite in the Vatican guesthouse known as Santa Marta.

The camerlengo and the other cardinals cannot make major decisions affecting the Church or change its teachings. The heads of most Vatican departments resign until the new pope confirms or replaces them.

Mourning rites last nine days, with the date of the funeral and burial to be decided by the cardinals. Universi Dominici Gregis says they should start between the fourth and sixth day after his death.

PAPAL FUNERAL

Pope Francis, who shunned much of the pomp and privilege of leading the global Catholic Church, modified and simplified the papal funeral rites in 2024.

The funeral Mass is still expected to be held in St. Peter's Square, but unlike many predecessors, Francis asked to be buried in Rome's St. Mary Major Basilica to be near his favourite icon of the Madonna.

Francis also asked to be buried in a simple wooden casket, unlike predecessors who were buried in three interlocking caskets made of cypress, lead and oak. He asked that his body not be put on display atop a raised platform, or catafalque, in St. Peter's Basilica for visitors in Rome to view, as was the case with previous popes.

READ: What we know ahead of Pope Francis's funeral

THE CONCLAVE

This photograph shows a giant screen depicting late Pope Francis and reading "This evening at 7:30 PM in Saint Peter's Square, a Rosary will be recited in suffrage of Pope Francis" on St Peter's square, following his death, in the Vatican on April 21, 2025. Alberto Pizzoli, AFP

Cardinals from around the world descend on Rome following the death of a pontiff. They hold daily meetings known as general congregations to discuss Church matters, and lay out the characteristics each believes the new pope should have.

Cardinals aged 80 or over can attend the general congregations but are not allowed to enter the conclave to choose the next pope, which is a gathering of cardinals under the age of 80. Much of the discussion takes place in personal interactions between the cardinals.

Traditionally, a mourning period of 15 days is observed before a conclave can begin. Before he resigned in 2013, Pope Benedict modified the constitution to allow it to begin sooner if the cardinals chose to, or a maximum of 20 days after the death if some cardinals have difficulty getting to Rome.

The conclave is held in the Sistine Chapel. Until the two conclaves in 1978 that elected John Paul I and John Paul II, the cardinals stayed in makeshift rooms around the Sistine Chapel.

Since the 2005 conclave that elected Pope Benedict, they have voted in the Sistine Chapel but stayed in the Santa Marta guest house, with about 130 rooms. Santa Marta is sealed off and they are taken by bus to the Sistine Chapel.

Conclave: The secretive process of electing a pope

The word conclave comes from the Latin for "with a key". It stems from a tradition that started in the 13th century where cardinals were locked up to force them to decide as quickly as possible and limit outside interference.

These days the participants are prohibited from any communication with the outside world. Phones, internet, and newspapers are not allowed and Vatican police use electronic security apparatus to enforce the rules.

Except for the first day of the conclave, when there is one vote, the cardinals vote twice a day.

A majority of two-thirds plus one is needed for election. If no one is elected after 13 days, a run-off is held between the two leading candidates but a two-thirds plus one majority is still needed. This is to promote unity and discourage seeking compromise candidates.

'HABEMUS PAPAM'

When the conclave has elected a pope, he is asked if he accepts and which name he wishes to take. If he declines, the procedure starts again.

The new pope dons white vestments that have been prepared in three sizes and sits on a throne in the Sistine Chapel to receive the other cardinals, who pay homage and pledge obedience.

The world will know that a pope has been elected when an official burns the paper ballots with special chemicals to make white smoke pour out of the chapel's chimney. Black smoke indicates an inconclusive vote.

The senior elector amongst the cardinal deacons, currently French Cardinal Dominique Mamberti, steps on to the central balcony of St. Peter's Basilica to announce to the crowds in the square "Habemus Papam" (We have a Pope).

The new pope then appears and gives the crowd his first blessing as pontiff.

(Production: Marissa Davison, Gosia Wojtunik, Vanessa Romeo)