The need for a more secure process became painfully obvious in the 13th century. Following the death of Pope Clement IV in 1268, the cardinals met in Viterbo, Italy, to elect his successor. They deadlocked for nearly three years—the longest interregnum in papal history. Frustrated by the delay, the local townspeople, acting on the advice of St. Bonaventure, took drastic measures: they locked the cardinals in the papal palace, removed the roof to expose them to the elements, and rationed their food to bread and water.
Derived from the Latin phrase cum clave (meaning "with a key"), the term refers to the practice of locking the cardinals of the Catholic Church away from the outside world until they have elected a new Bishop of Rome. It is a process shrouded in secrecy, steeped in tradition, and governed by a constitution that balances spiritual discernment with practical logistics. The Conclave
The pressure worked. In 1271, they elected Pope Gregory X. To prevent such chaotic delays in the future, Gregory X issued the papal bull Ubi periculum in 1274, formally establishing the Conclave. The rules were strict: the cardinals were to be locked in a communal area, with no contact with the outside world, and their diet was to be reduced progressively if they took too long to decide. This established the fundamental principle that an election requires isolation to ensure spiritual focus, free from external political pressure. While the spirit of cum clave remains, the specific rules have evolved significantly. Today, the process is governed by the Apostolic Constitution Universi Dominici Gregis , promulgated by Pope John Paul II in 1996, with amendments by Pope Benedict XVI and Pope Francis. The need for a more secure process became
It is a common misconception that the new pope must be a cardinal. In theory, any baptized Catholic male is eligible. In practice, however, the last time a non-cardinal was elected was in 1378 (Pope Urban VI). The electors almost invariably choose one of their own, someone they have come to know through the General Congregations. The Conclave officially begins when the cardinals process into the Sistine Chapel. The image of these princes of the Church, clad in their scarlet choir dress, singing the Veni Creator Spiritus (Come Frustrated by the delay, the local townspeople, acting
The process begins with the "Sede Vacante" (the empty seat). Upon the death or resignation of a pope, the College of Cardinals assumes the governance of the Church, though they can make no new laws or appoint new bishops. They are summoned to Rome for the General Congregations—meetings where they discuss the needs of the Church and the qualities required in the next pope. The most critical restriction introduced in the modern era concerns age. Only cardinals under the age of 80 are eligible to vote. This rule, established by Pope Paul VI, ensures that the electors are men with the energy and contemporary perspective to guide the Church forward. The number of electors is capped at 120, though Pope Francis has occasionally appointed more, temporarily exceeding the limit.