Pope Francis died on Easter on Monday at the age of 88. His death set off mourning across the Catholic world and days of ritual at the Vatican.
Here are the key things to know about the funeral of the first Latin American pontiff in the church's history:
When and where is his funeral being held?
His funeral is being held on Saturday in St. Peter's Square. Francis will then be buried, according to his will: in a simple underground tomb at St. Mary Major Basilica.
The church is home to his favorite icon of the Virgin Mary, to whom he was particularly devoted.
The sealing of the coffin
The night before the funeral, the camerlengo presided over the closing and sealing of the coffin, in the presence of other senior cardinals. A white cloth was placed over Francis' face.
A bag containing coins minted during his papacy was placed in the coffin along with a one-page written account of his papacy — known in Italian as a “rogito,” a word indicating an official deed.
It was read aloud by the master of liturgical ceremonies and then rolled up and slipped inside a cylindrical tube that was placed inside the coffin. Another copy is kept in the Vatican archives.
The covers of both the zinc coffin and the wooden one bear a cross and Francis' papal coat of arms.
Why not at the Vatican?
Francis had said he wanted to be buried not in St. Peter's Basilica or its grottoes, where most popes are buried, but in the St. Mary Major Basilica across town. His choice reflects his veneration of an icon of the Virgin Mary that is located there, the Salus Populi Romani (Salvation of the people of Rome).
Before and after every foreign trip, Francis would go to the basilica to pray before the Byzantine-style painting that features an image of Mary, draped in a blue robe, holding the infant Jesus who in turn holds a jewelled golden book.
Which dignitaries are expected to attend?
Heads of state, including US President Donald Trump, Ukrainian President Volodymyr Zelenskyy and French President Emmanuel Macron, are among those expected for the funeral.
Others dignitaries include: Prince William, German President Frank-Walter Steinmeier and European Council President António Costa.
How long did the pope serve?
Pope Francis had a 12-year papacy during which he charmed the world with his humility and concern for the poor. But the Argentina-born pope also alienated conservatives with critiques of capitalism and climate change.
So, how do they choose a new pope?
The death of a pope starts a centuries-old ritual to elect a new one, involving sacred oaths by the cardinals, the piercing of ballots with a needle and thread after they're counted, and then burning them to produce either the white or black smoke to signal if there's a new leader for the world's 1.4 billion Catholics.
With the burial, the Catholic Church begins nine days of official mourning, known as the “novemdiales”. The date of the conclave to elect a new pope has not yet been announced.
In the conclave, the cardinals will vote in secret sessions, and the ballots will be burned in a special stove after each session. Black smoke indicates no pope has been elected; white smoke says the cardinals have chosen the next head of the Catholic Church.
Any baptized Catholic male is eligible, though only cardinals have been selected since 1378. The winner must receive at least two-thirds of the vote from those cardinals under age 80 who are eligible to participate.
Francis appointed the vast majority of electors, often tapping men who share his pastoral priorities, which suggests continuity rather than rupture.
While it's impossible to predict who the next pope will be, some cardinals are considered to have better chances than others.
The legacy of Francis
Francis was known for his personal simplicity, from the choice of his name Francis in honour of St. Francis of Assisi, who renounced wealth to help the poor, to the outward symbols and priorities of his papacy.
He chose to live in the Vatican's Domus Santa Marta hotel instead of the Apostolic Palace and wore his old orthotic shoes and not the red loafers of the papacy.
In his teachings, he focused on concern for refugees and other marginalised people. His first trip outside Rome as pope in 2013 was to the Sicilian island of Lampedusa to meet with newly arrived migrants. His plea for welcome put him at odds with US and European policies.
He also also signalled a more welcoming stance toward LGBTQ+ people, while also making the fight against climate change a priority. Francis became the first pope to use scientific data in a major teaching document and made care for God's creation a hallmark of his papacy.
He eschewed the grandiose even in his departure, lying in state in a simple coffin made of wood.