VATICAN CITY >> Black smoke poured out of the Sistine Chapel chimney on Wednesday, signalling 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 on Thursday 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 proceedings on giant video screens, applauding when the Sistine Chapel’s doors slammed shut and the voting began. They waited for hours, watching screens that showed just a skinny chimney and occasional seagull. After the vote dragged on to dinnertime, some left in frustration, but those who stayed cheered when the smoke finally billowed out.

“My hope is that cardinals will choose a man who can be a peacemaker and could reunify the church,” said Gabriel Capry, a 27-year-old from London.

Hailing from 70 countries, the cardinals were sequestered Wednesday from the outside world, their cellphones surrendered and airwaves around the Vatican jammed to prevent all communications until they find a new pope.

Francis named 108 of the 133 “princes of the church,” choosing many pastors in his image from far-flung countries like Mongolia, Sweden and Tonga that had never had a cardinal before.

His decision to surpass the usual limit of 120 cardinal electors and include younger ones from the “global south” — often marginalized countries with lower economic clout — has injected an unusual degree of uncertainty in a process that is always full of mystery and suspense.

Many cardinals hadn’t met until last week and lamented they needed more time to get to know one another, raising questions about how long it might take for one man to secure the two-thirds majority, or 89 ballots, necessary to become the 267th pope.

“Wait and see, a little patience, wait and see,” said Cardinal Mario Zenari, the Vatican’s ambassador to Syria.

The cardinals had entered the Sistine Chapel in pairs, chanting the meditative “Litany of the Saints” as Swiss Guards stood at attention. The hymn implores the saints to help the cardinals find a leader of the 1.4 billion-strong church.

Cardinal Pietro Parolin, the 70-year-old secretary of state under Francis and himself a leading contender to succeed him as pope, assumed the leadership of the proceedings as the senior cardinal under age 80 eligible to participate.