Innocent V. (Pierre de Champagni or de Tarentaise), pope from the 21st of January to the 22nd of June 1276, was born about 1225 in Savoy and entered the Dominican order at an early age. He studied theology under Thomas Aquinas, Albertus Magnus and Bonaventura, and in 1262 was elected provincial of his order in France. He was made archbishop of Lyons in 1271; cardinal-bishop of Ostia and Velletri, and grand penitentiary in 1275; and, partly through the influence of Charles of Anjou, was elected to succeed Gregory X. As pope he established peace between the republics of Lucca and Pisa, and confirmed Charles of Anjou in his office of imperial vicar of Tuscany. He was seeking to carry out the Lyons agreement with the Eastern Church when he died. His successor was Adrian V. Innocent V., before he became pope, prepared, in conjunction with Albertus Magnus and Thomas Aquinas, a rule of studies for his order, which was accepted in June 1259. He was the author of several works in philosophy, theology and canon law, including commentaries on the Scriptures and on the Sentences of Peter Lombard, and is sometimes referred to as famosissimus doctor. He preached the funeral sermon at Lyons over St Bonaventura. His bulls are in the Turin collection (1859).
See F. Gregorovius, Rome in the Middle Ages, vol. 5, trans, by Mrs G. W. Hamilton (London, 1900–1902); A. Potthast, Regesta pontif. Roman, vol. ii. (Berlin, 1875); E. Bourgeois, Le Bienheureux Innocent V (Paris, 1899) ; J. E. Borel, Notice biogr. sur Pierre de Tarentaise (Chambéry, 1890); P. J. Béthaz, Pierre des Cours de la Salle, pape sous le nom Innocent V (Augustae, 1891); L. Carboni, De Innocentio V. Romano pontifice (1894).