For comparison's sake, Benedict was elected on the fourth ballot in 2005 — but he was the clear front-runner going into the vote. Pope John Paul II was elected on the eighth ballot in 1978 to become the first non-Italian pope in 455 years.
Patrizia Rizzo ran down the main boulevard to the piazza with her two children as soon as she heard the news on the car radio. "I parked the car ... and dashed to the square, she said. "It's so exciting, as Romans we had to come."
Bergoglio's legacy as cardinal includes his efforts to repair the reputation of a church that lost many followers by failing to openly challenge Argentina's murderous 1976-83 dictatorship. His own record as the head of the Jesuit order in Argentina at the time has been tarnished as well.
Many Argentines remain angry over the church's acknowledged failure to openly confront a regime that was kidnapping and killing thousands of people as it sought to eliminate "subversive elements" in society. It's one reason why more than two-thirds of Argentines describe themselves as Catholic, but fewer than 10 percent regularly attend mass.
Under Bergoglio's leadership, Argentina's bishops issued a collective apology in October 2012 for the church's failures to protect its flock. But the statement blamed the era's violence in roughly equal measure on both the junta and its enemies.
"Bergoglio has been very critical of human rights violations during the dictatorship, but he has always also criticized the leftist guerrillas; he doesn't forget that side," Rubin said.
Bergoglio's own role in the so-called Dirty War has been the subject of controversy.
At least two court cases directly involved Bergoglio. One examined the torture of two of his Jesuit priests who were kidnapped in 1976 from the slums where they advocated liberation theology. One accused Bergoglio of effectively handing him over to the junta.
Both men were freed after Bergoglio took extraordinary, behind-the-scenes action to save them — including persuading dictator Jorge Videla's family priest to call in sick so that Bergoglio himself could say Mass in the junta leader's home, where he privately appealed for mercy. His intervention likely saved their lives, but Bergoglio never shared the details until Rubin interviewed him for a 2010 biography.
Rubin said failing to challenge the dictators was simply pragmatic at a time when so many people were getting killed, and attributed Bergoglio's later reluctance to share his side of the story as a reflection of his humility.
Bergoglio also was accused of turning his back on a family that lost five relatives to state terror, including a young woman who was 5-months' pregnant before she was kidnapped and eventually killed in 1977. The woman's child, who survived, was given to an "important" family.
Despite written evidence indicating he knew the child had been given away, Bergoglio testified in 2010 that he didn't know about any stolen babies until well after the dictatorship was over.
Unlike the confusion that reigned during the 2005 conclave, the smoke this time around has been clear: black during the first two rounds of burned ballots, and then a clear white on Wednesday night — thanks to special smoke flares akin to those used in soccer matches or protests that were lit in the chapel ovens.
The Vatican on Wednesday divulged the secret recipe used: potassium perchlorate, anthracene, which is a derivative of coal tar, and sulfur for the black smoke; potassium chlorate, lactose and a pine resin for the white smoke.
The chemicals are contained in five units of a cartridge that is placed inside the stove of the Sistine Chapel. When activated, the five blocks ignite one after another for about a minute apiece, creating the steady stream of smoke that accompanies the natural smoke from the burned ballot papers.
Despite the great plumes of smoke that poured out of the chimney, Lombardi said, neither the Sistine frescoes nor the cardinals inside the chapel suffered any smoke damage.
Reporters Karl Ritter, Rachel Zoll and Daniela Petroff contributed.
Follow Nicole Winfield at www.twitter.com/nwinfield
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