Papal elections since 1276 have taken the form of conclaves, which are elections that follow a set of rules and procedures developed in In nomine Domini (1059), Ubi periculum (1274) and later papal bulls; observance of the conclave varied until 1294, but all papal elections since have followed relatively similar conclave procedures.[1]
Although the cardinals have historically gathered at a handful of other locations within Rome and beyond, only five elections since 1455 have been held outside the Apostolic Palace.[2] Twenty-eight papal elections have been held outside Rome, in: Terracina (1088), Cluny (1119), Velletri (1181), Verona (1185), Ferrara (October 1187), Pisa (December 1187), Perugia (1216, 1264–1265, 1285, 1292–1294, 1304–1305), Anagni (1243), Naples (1254, 1294), Viterbo (1261, 1268–1271, July 1276, August–September 1276, 1277, 1281–1282), Arezzo (January 1276), Carpentras/Lyon (1314–1316), Avignon (1334, 1342, 1352, 1362, 1370), Konstanz (1417) and Venice (1799–1800). Three elections moved between locations while in progress: the elections of 1268–1271, 1292–1294, and 1314–1316.
^In the early days of the College of Cardinals, a total of seven cardinal-bishop positions existed, assuming all positions are filled at the time of an election, this represents the maximum number of potential electors. (Baumgartner, p. 27)
^According to the official protocol, Gregory was selected by an assembly in St. Peter that included cardinals and priests of the church, with the consent of attending bishops and by the acclamation of the crowd. It is unclear if the new 1059 rules were followed during his election. (Baumgartner p.24)
^The election took place on 24 May 1086. However, the newly elected Desiderius initially refused the position, only accepting it at the Synod of Capua in March 1087. He was crowned on 9 May 1087.
^Probably the first conclave that closely followed the 1059 rules. The group that elected Urban II was larger than that which had previously elected Victor III.
^The first election under the 1059 rules for which a detailed account exists. Four cadinal-bishops along with 45 other non-voting cardinals were present when Gelasius II was elected unanimously.
^Gelasius II was accompanied by 4 cardinal-bishops to France, where Gelasius died. The 4 cardinals elected his chosen successor. This marks the first election and coronation of a pope far away from Rome, and confirms the 1059 provision that a small number of cardinals could elect a pope under special circumstances.
^Following the death of Callixtus, the Pierleoni and Frangipani families fought over the papal election. The cardinals initially elected Celestine II (not to be confused with the later pope Celestine II), but under duress by the Frangipani renounced his election, and the Frangipani-supported Honorius II was chosen by acclaim. Honoris then renounced this irregular acclamation, and was elected using the proper procedure the next day, after the remaining electors had been either bought off or threatened by Frangipani forces.
^Innocent II was elected by a small group of cardinals supporting Haimeric, the cardinal instrumental in the election of Honorius.
^Anacletus was chosen by a majority of the 41 cardinals opposed to Haimeric. This marks a departure from the previous election under the 1059 rules, in which only the cardinal-bishops were eligible to vote. Despite Anacletus' stronger support among the cardinals, he failed to be recognized by the northern European monarchs, and died before his opponent innocent. Anacletus successor Victor submitted to Innocent within a year of his election, both have since been considered antipopes.
^elected "entirely consistent with the decree of 1059". Unclear if that means that only the small group of cardinal-bishops voted or the entire College of Cardinals.
^This represents the largest group of cardinal-electors since the creation of the papal conclave. (Ignoring some aberrations in the 12th century before the conclave format was fully established)
^Baumgartner, Frederic J. (2003). ""I Will Observe Absolute and Perpetual Secrecy:" The Historical Background of the Rigid Secrecy Found in Papal Elections". Catholic Historical Review. Vol. 89, Issue 2. pp. 165–181.
^Walsh, Michael J. (2003). The Conclave. Rowman & Littlefield. p. 8. ISBN1-58051-135-X.
^ abcdefgChambers, DS. 1978. "Papal Conclaves and Prophetic Mystery in the Sistine Chapel". Journal of the Warburg and Courtauld Institutes, Vol. 41: pp. 322–326
^Greeley, Andrew M. 2005. The Making of the Pope: 2005. Brown, Little. ISBN0-316-86149-9.