VATICAN CITY (AP) — One hundred and thirty-three cardinals are sequestering themselves behind the Vatican’s medieval walls for the start of a conclave starting Wednesday to elect a successor to Pope Francis. Here are some things to know about the election of the 267th pontiff of the Catholic Church, which has 1.4 billion faithful across the world.

Catholic cardinals are gathering at the Vatican to elect the successor to Pope Francis, who died on April 21. Voting will take place in the Sistine Chapel, with ballots continuing in succession until any candidate secures two-thirds of the available votes.