1227 papal election
The 1227 papal election, was convoked after the death of Pope Honorius III on 18 March 1227 at Rome.
The cardinals present at Rome assembled in the Septizodium on the next day after the death of Honorius III and decided to elect the new Pope by compromissum, meaning not by the whole Sacred College of Cardinals but by the committee of few of them, empowered by the rest to appoint the new Pontiff. The same procedure had been already used in the previous election. The committee numbered three cardinals, among whom were cardinal-bishops Ugolino di Segni of Ostia and Konrad von Urach of Porto. Initially the committee elected its member Konrad von Urach with two votes out three, but he refused the tiara. Hereupon the rest of cardinals unanimously elected Ugolino di Segni on 19 March 1227. He reluctantly accepted the high honour, taking the name of Gregory IX.
The new Pope received the pallium in the Vatican Basilica on 21 March 1227, and on the same day was enthroned in the Lateran Basilica. On 11 April 1227, his relative Ottaviano Conti di Segni, archdeacon of the Sacred College, solemnly crowned him in the Basilica di S. Maria in Maggiore.
List of participants
Probably 15 out of 18 cardinals participated in the election:Absentee cardinal
Probably three cardinals were absent:| Elector | Cardinalatial title | Elevated | Elevator | Notes |
| Stephen Langton | S.R.E. cardinalis | 27 May 1206 | Innocent III | Archbishop of Canterbury 1207–1228; resigned his titulus S. Crisogono after receiving episcopal consecration in 1207; external cardinal |
| Giovanni Colonna di Carbognano | Priest of S. Prassede | 27 May 1206 | Innocent III | Rector of Spoleto |
| Romano Bonaventura | Deacon of S. Maria in Portico | 5 March 1216 | Innocent III | Papal Legate in the southern France |