[15] At the conclusion of his term, and after Thomas of Aquinas' rejoinder to his critics was circulated, Peter returned to his chair at the University of Paris (1267).

[16] On 6 June 1272, Pope Gregory X himself named Peter of Tarantaise to be Archbishop of Lyons, a post he held until he was appointed to be Bishop of Ostia.

[19] Pope Gregory himself arrived in Lyons in mid-November, 1273, intent upon bringing as many prelates as possible to his planned ecumenical council.

Their conversations were obviously harmonious, since Philip ceded to the Church the Comtat Venaissin, which he had inherited from his uncle Alphonse, Count of Toulouse.

Peter of Tarantaise was elevated to the cardinalate on 3 June 1273, in a Consistory held at Orvieto by Pope Gregory X, and named Bishop of the suburbicarian See of Ostia.

[24] There were seven cardinals with the Pope at the time, and their names are mentioned in the record of the oath-taking: Petrus Ostiensis, Ancherus Pantaleone of S. Prassede, Guglelmus de Bray of S. Marco, Ottobono Fieschi of S. Adriano, Giacomo Savelli of S. Maria in Cosmedin, Gottifridus de Alatri of S. Giorgio in Velabro, and Matteo Rosso Orsini of S. Maria in Porticu.

[25] According to the Constitution "Ubi Periculum" which had been approved by the Council of Lyons, the Conclave to elect his successor was to begin ten days after the pope's death.

After the required ten days had passed, the Cardinals assembled on the Vigil of St. Agnes (20 January) to hear the customary Mass of the Holy Spirit.

[29] On 22 February 1276, the Feast of S. Peter's Chair, Pope Innocent was crowned in the Vatican Basilica by Cardinal Giovanni Gaetano Orsini.

On 2 March 1276, Pope Innocent granted King Charles I of Naples the privilege of retaining the Senatorship of Rome, the government of the city, and the Rectorship of Tuscia.

[31] On 9 March, he wrote to Rudolf, King of the Romans, begging him not to come to Italy, and if he had already started his journey, to break it off, until an agreement between him and the Papacy could be finalized.

On 17 March he wrote again to Rudolf, advising him to meet the papal nuncios, and that, in their negotiations, he should by no means introduce the topic of the Exarchate of Ravenna, the Pentapolis, and the Romandiola.

The French Innocent's favoritism toward King Charles, the brother of Louis IX and uncle of Philip III, and his harshness toward Rudolf was beginning to change the balance of power in Italy once more and was pointing in the direction of war.

[32] On the 26th he ordered the Bishops of Parma and Comacchio to see to it that Boniface de Lavania (Lavagna) be installed as Archbishop of Ravenna, as Pope Gregory X had decided.

Guy de Sully, OP, the Dominican Provincial of Paris (a post that Innocent himself had held until 1272, when he was appointed Archbishop of Lyon), to the see of Bourges.

He was proceeding to send legates to the Emperor in connection with the recent decisions of the Second Council of Lyons, hoping to broker a peace between Constantinople and King Charles I of Naples.

Bartolommeo, O.Min., of Bologna, a Doctor of Sacred Scripture, to travel to the East, but he ordered him to come to Rome first, so that a suitable suite could be chosen for him.

Pope Innocent V was the author[40] of several works of philosophy, theology, and canon law,[41] including commentaries on the Pauline epistles,[42] and on the Sentences[43] of Peter Lombard.