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About 133 cardinals from around the world will gather in the Vatican City to choose the next pope, in a conclave, beginning on May 7th.
When white smoke rises from the chimney of the Sistine Chapel, the world will know that a new Pontiff has been selected.
The BBC looked back at the archival footage of the results of previous conclavi, from Pope Pius XII in 1939 to Pope Francis in 2013.
See the moment when the choice of each pope was announced and how long it took to the Cardinals to choose them.
Video edited by Ian Ikman.