The Vatican has announced that the conclave to elect Pope Francis's successor will begin on May 7. Here's a look at the key facts about the conclave, one of the oldest and most secretive elections in the world.

Roman Catholic cardinals will gather in the Sistine Chapel starting May 7 to elect the 267th pontiff and successor to Pope Francis. A total of 135 cardinals, aged under 80 at the time of Francis’s death, are eligible to participate, though it's uncertain if all will attend.

Cardinals aged 80 or over can participate in daily meetings called general congregations, but cannot vote. The conclave will take place in the Sistine Chapel, with cardinals isolated from the outside world during the process. Communication devices such as phones, TV, and the internet are strictly forbidden.

The history of the conclave dates back to 1241, with its name originating from the Latin term “cum clave,” meaning “with a key.” Over the years, conclaves have varied in length, with the most recent one in 2013 lasting just two days. Ballots are held twice daily, with votes burned to produce either black or white smoke, indicating whether a decision has been reached.

Once a pope is chosen, a senior cardinal announces the new leader to the world with the Latin phrase "Habemus Papam" and reveals the pope’s chosen name. The newly elected pope then addresses the public in St. Peter's Square and delivers the first "Urbi et Orbi" blessing.

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