How long has a conclave gone? Facts about the secret vote to elect the Pope

Cardinals are set to begin the conclave to choose the next Pope, but there's several facts about the secret vote that may not be known.

“Conclave” the film may have introduced moviegoers to the spectacular ritual and drama of a modern conclave, but the periodic voting to elect a new pope has been going on for centuries and created a whole genre of historical trivia.

Here are some facts about conclaves past, derived from historical studies including Miles Pattenden’s “Electing the Pope in Early Modern Italy, 1450–1700,” and interviews with experts including Elena Cangiano, an archeologist at Viterbo’s Palazzo dei Papi (Palace of the Popes).

In the 13th century, it took almost three years — 1,006 days to be exact — to choose Pope Clement IV’s successor, making it the longest conclave in the Catholic Church’s history. It’s also where the term conclave comes from — “under lock and key,” because the cardinals who were meeting in Viterbo, north of Rome, took so long the town’s frustrated citizens locked them in the room.

The secret vote that elected Pope Gregory X lasted from November 1268 to September 1271. It was the first example of a papal election by “compromise,” after a long struggle between supporters of two main geopolitical medieval factions — those faithful to the papacy and those supporting the Holy Roman Empire.

Gregory X was elected only after Viterbo residents tore the roof off the building where the prelates were staying and restricted their meals to bread and water to pressure them to come to a conclusion. Hoping to avoid a repeat, Gregory X decreed in 1274 that cardinals would only get “one meal a day” if the conclave stretched beyond three days, and only “bread, water and wine” if it went beyond eight. That restriction has been dropped.

Before 1274, there were times when a pope was elected the same day as the death of his predecessor. After that, however, the church decided to wait at least 10 days before the first vote. Later that was extended to 15 days to give all cardinals time to get to Rome. The quickest conclave observing the 10-day wait rule appears to have been the 1503 election of Pope Julius II, who was elected in just a few hours, according to Vatican historian Ambrogio Piazzoni. In more recent times, Pope Francis was elected in 2013 on the fifth ballot, Benedict XVI won in 2005 on the fourth and Pope Pius XII won on the third in 1939.

The first conclave held under Michelangelo’s frescoed ceiling in the Sistine Chapel was in 1492. Since 1878, the world-renowned chapel has become the venue of all conclaves. “Everything is conducive to an awareness of the presence of God, in whose sight each person will one day be judged,” St. John Paul II wrote in his 1996 document regulating the conclave, “Universi Dominici Gregis.” The cardinals sleep a short distance away in the nearby Domus Santa Marta hotel or a nearby residence.

Most conclaves were held in Rome, with some taking place outside the Vatican walls. Four were held in the Pauline Chapel of the papal residence at the Quirinale Palace, while some 30 others were held in St. John Lateran Basilica, Santa Maria Sopra Minerva or other places in Rome. On 15 occasions they took place outside Rome and the Vatican altogether, including in Viterbo, Perugia, Arezzo and Venice in Italy, and Konstanz, Germany, and Lyon, France.