1285 papal election
The 1285 papal election, convened in Viterbo after the death of Pope Martin IV, elected Cardinal Giacomo Savelli, who took the name Honorius IV. Because of the suspension of the apostolic constitution Ubi periculum by Adrian V in 1276, this election was technically not a papal conclave. In fact, for the first time since the tedious papal election of 1268–1271, the meetings were dominated neither by the Hohenstaufen nor Charles I of Naples. It may even be that the cardinals proceeded so swiftly to an election with the intention of forestalling any intervention from Naples.
Participants
Pope Martin IV, who was living at Perugia, never having visited the city of Rome, was stricken ill with a slow fever on Easter Sunday, March 25, and died on March 28, 1285. At that time, there were 18 living cardinals in the Sacred College, though three of them were away as Legates and were not notified in time. Fifteen of them participated in the election of his successor:Absentee cardinals
Three cardinals were absent:| Elector | Nationality | Cardinalatial Title | Elevated | Elevator | Notes |
| Gerardo Bianchi | Italian | Bishop of Sabina | 1278, March 12 | Nicholas III | Papal Legate in the Kingdom of Sicily |
| Bernard Languissel | French | Bishop of Porto e Santa Rufina | 1281, April 12 | Martin IV | Papal Legate in Lombardy and Tuscany |
| Jean Cholet | French | Priest of S. Cecilia | 1281, April 12 | Martin IV | Papal Legate in France |