VATICAN CITY — Black smoke poured out of the Sistine Chapel chimney on Wednesday, signaling that no pope had been elected as 133 cardinals opened the secretive, centuries-old ritual to choose a new leader of the Catholic Church.

The cardinals participating in the most geographically diverse conclave in the faith’s 2,000-year history took just one round of voting Wednesday evening. After failing to find a winner on the first ballot, they retired for the night and will return to the Sistine Chapel this morning to try to find a successor to Pope Francis.

They had opened the conclave Wednesday afternoon, participating in a rite more theatrical than even Hollywood could create, a wash of red-robed cardinals, Latin chants, incense and solemnity that underscored the seriousness of the moment.

Outside in St. Peter’s Square, the scene was festive, as thousands of people flocked to the piazza to watch the proceed