Pope Leo was among several cardinals who turned to the film “Conclave” for pointers prior to the start of the election this week.

The first thing the new pope will do is choose a name. In the history of the papacy, the most commonly used name has been John, first chosen in 523 by Saint John I, the Vatican says. The last pope to choose that name was Italian Angelo Giuseppe Roncalli, elected Pope John XXIII, in 1958. Roncalli was proclaimed a saint by Pope Francis in 2014.

The conclave to select the next pope has begun after Catholic cardinals from across the world filed into the Sistine Chapel Wednesday before sealing themselves inside.