Who will be the next pope? The decision could have a profound impact on the Catholic Church and the world's 1.4 billion baptised Roman Catholics.

It also promises to be a highly unpredictable and open process for a host of reasons.

The College of Cardinals will meet in conclave in the Sistine Chapel to debate and then vote for their preferred candidates until a single name prevails.

With 80% of the cardinals appointed by Pope Francis himself, they are not only electing a pope for the first time, but will offer a broad global perspective.

For the first time in history, fewer than half of those given a vote will be European.

And although the college may be dominated by his appointments, they were not exclusively "progressive" or "traditionalist".

For those reasons, it is harder than ever to predict who will be elected the next pope.

Could the cardinals elect an African or an Asian pope, or might they favour one of the old hands of the Vatican administration?

Here are some of the names being mentioned as Francis's potential successor.

Nationality: Italian

Age: 70

Softly spoken Italian Cardinal Parolin was the Vatican's secretary of state under Pope Francis – making him the pope's chief adviser. The secretary of state also heads the Roman Curia, the Church's central administration.

Having acted effectively as deputy pope, he could be considered a frontrunner.

He is viewed by some as more likely to prioritise diplomacy and a global outlook than the purity of Catholic dogma. His critics consider that a problem, while his supporters see a strength.

But he has been critical of the legalisation of same-sex marriage around the world, calling a landmark 2015 vote in favour in the Republic of Ireland "a defeat for humanity".

The bookmakers may back him but Cardinal Parolin will be well aware of an old Italian saying that stresses the uncertainty of the pope-picking process: "He who enters a conclave as a pope, leaves it as a cardinal."

Some 213 of the previous 266 popes have been Italian and even though there has not been an Italian pope in 40 years, the pivot of the upper echelons of the Church away from Italy and Europe may mean there may not be another for now.

Nationality: Filipino

Age: 67

Could the next pope come from Asia?

Cardinal Tagle has decades of pastoral experience – meaning he has been an active Church leader among the people as opposed to a diplomat for the Vatican or cloistered expert on Church law.

The Church is massively influential in the Philippines, where about 80% of the population is Catholic. The country currently has a record five members of the College of Cardinals – which could make for a significant lobbying faction if they all back Cardinal Tagle.

He is considered a moderate within the Catholic definition, and has been dubbed the "Asian Francis" because of a dedication to social issues and sympathy for migrants that he shared with the late pope.

He has opposed abortion rights, calling them "a form of murder" – a position in line with the Church's broader stance that life begins at conception. He has also spoken against euthanasia.

But in 2015 when he was Archbishop of Manila, Cardinal Tagle called........

© BBC