1455 Conclave
elected Callixtus III4–8 April 1455 · The early modern conclaves · Apostolic Palace, Papal States
The 1455 papal conclave (4–8 April) elected Cardinal Alfons de Borja as Pope Callixtus III following the death of Pope Nicholas V. The conclave was the first in the Apostolic Palace, the site of all but five papal conclaves thereafter.
Elected pope
Callixtus III
Alfons de Borja
Succeeded
Nicholas V
Duration
5 days
Cardinal electors
—
locked in under conclave rules
Key officials
| Dean | Giorgio Fieschi |
| Camerlengo | Ludovico Trevisan |
Ballot-by-ballot tallies are destroyed by design — the paper is burned in the stove whose smoke announces the result — so this entry records what the Church documents: the dates, the electors, the number of ballots where known, and the man who walked out onto the balcony.