A list of the bishops of the diocese of Grenoble was compiled by Bishop Hugues (1080–1132) in his cartulary, and carried forward until the mid-15th century.Duchesne, pp. 230–231.
The names, dates, and order of the bishops between 1230 and 1340 is the subject of confusion, in the sources and in the modern authorities. Barthélémy Hauréau, in 1860, cited an unpublished document dated 1310, written by Bishop Guillelmus,Hauréau, Gallia christiana XVI, p. 245. in which the bishop refers to his predecessors by name and order: Soffredus, Petrus, Falco, and Guillelmus."Venerabiles patres, quondam superna gratia Gratianopolitani episcopi succesive, videlicet dominus Soffredus, quondam episcopus praedicti loci, et dominus Petrus, post ipsum episcopus ejusdemloci, et post ipsos dominus Falco episcopus ejusdem loci, et dominus Guillelmus, episcopus ejusdem loci post praedictos, praedecessores nostri episcopi memorati...." Hauréau concludes that the author, Bishop Guillelmus, is the immediate successor of the bishop Guillelmus mentioned in the text. Most authorities, therefore, are wrong in stating that there was a third bishop Guillelmus, who was in office in 1310, and in stating that there was an episcopal election in 1302."Castiganda nunc superest eorum sententia. Hi qui duos inter Guillelmum de Sassenage et Joannem de Chissey Guillelmos recensent, ambos eodem cognomento de Royn appellant...."
To 1000
381–384 : DomninusBishop Domninus attended the Council of Aquileia in 381. The statement that he died on 3 November 386 is without any documentary evidence. Whether he is to be regarded as a saint or not is the subject of dispute. Hauréau, Gallia christiana XVI, p. 219. : Diogenus : Amicus 420 : Sebastianus 439–? : Vitalianus 441–459 : CeretiusBishop Ceretius (Ceratus) was present at the Council of Orange on 8 November 441 ("Ex prouincia qua supra ciuit. Gratianopolitana Cheretius episcopus, Iocundus diaconus."), and the Council of Vaison on 13 November 442 ("Ex prouincia qua supra ciuit. Gratianopolytana Ceretius episcopus, Iocundus et Bitio diaconi."). He is mentioned in a letter of Bishop Eusebius of Milan in 451. C. Munier, Concilia Galliae (Turnholt: Brepols 1963), pp. 87, 90, 102. Duchesne, p. 231, no. 6. 464 : ViventiusExcept for his name in Bishop Hugues' list, Bishop Viventius is attested only on 25 February 464, as one of the addressees of a letter of Pope Hilarius. Monumenta Germaniae Historica. Epistolarum Tomus III. Merowingici et Karolini Aevi, Vol. I (Berlin: Weidmann 1892), pp. 30–31, no. 21. Rémy, Bernard; Jospin, Jean-Pascal, Cularo Gratianopolis Grenoble. (Lyon: Presses Universitaires Lyon, 2006), p. 116. 517–518 : VicturiusBishop Victurius is attested as having been present at the Council of Epaona (517), and the Council of Lyon (518). Jacques Sirmond, Conciliorum Galliae collectio, , Vol. I (Paris: Didot 1789), pp. 898 ("Victurius in Christi nomine episcopus civitatis gratianopolitan."), 905 ("Victurius episcopus in Christi nomine consensi."); he also exchanged letters with Bishop Avitus of Vienne (494–518). Duchesne, p. 231, no. 8. 538 : UrsolusBishop Ursolus was present at the Council of Orléans on 7 May 538. C. De Clerq, Concilia Galliae A. 511 – A. 695 (Turnholt: Brepols 1963), p. 129 ("Vrsolus in Christi nomine ecclesiae Gratianopolitanae episcopus consensi."). Duchesne, p. 231, no. 9. 552–570 : Syagrius (I)Syagrius may have been the bishop who subscribed his name, but not his diocese, at the Council of Paris in 552 (De Clerq, p. 169). He was present at the Council of Lyon in 573. Hauréau, p. 221. Duchesne, p. 231, no. 10. 573–601/608 : HesychiusBishop Hesychius was present at the Council of Paris on 11 September 573 (De Clerq, p. 215: "Esychius in Christi nomine episcopus eclesiae Gratianopolitanae Constitutionem nostram subscripsi."); the Council of Mâcon on 1 November 581 (De Clerq, p. 215: "Esychius in Christi nomine episcopus eclesiae Gratianopolitanae Constitutionem nostram subscripsi."); the Council of Valence on 22 June 584 (De Clerq, p. 235: "Isitius in Christi nomine episcopus ecclesiae Gratianopolitanae subscripsi."); the Council of Mâcon in 585 (De Clerq, p. 248: "Estitius episcopus ecclesiae Gracinopolitane subscripsi."); and the Council of Figura in 589. Duchesne, pp. 231–232, no. 11. 614–626 : Syagrius (II)Bishop Syagrius participated in the Council of Paris in 614. De Clerq, p. 281 ("Ex ciuitate Gracinopoli Suagrius episcopus"). Hauréau, pp. 221–222. Duchesne, p. 232, no. 12. 650 : ClarusBishop Clarus attended the Council of Chalon-sur-Saône (Cabilonense) in 650 (De Clerq, p. 308: "Clarus episcopus ecclesie Gracinopolitane subscripsi."). Hauréau, p. 222. Duchesne, p. 232, no. 13. 653 : FerreolusIt is claimed, on the authority of a liturgical text, that Ferreolus was strangled by the Master of the Neustrian Palace, Ebroin, in 683. Ebroin, however, was dead by 681. It is disputed whether Ferreolus was a martyr or not; Ebroin was involved in a political dispute with the leaders of Burgundy, who wanted independence from Neustria. Acta Sanctorum Januarii Tomus I (Antwerp: Johannes Meursius 1642), p. 743. Hauréau, p. 222. Duchesne, p. 232, no. 14. 664 : BosoBoso is only a name in Bishop Hugues' list. Hauréau, p. 222. Duchesne, p. 230. 690 : Hesychius (II) 699 : Austrobertus 707 : Ramnoldus 726 : RagnomarusBishop Ragnomarus subscribed a decree for the appointment of an abbot of the monastery of Novalese in the territory of Susa, on 30 January 726. Carlo M. Cipolla, Monumenta Novaliciensia vetustiora: raccolta degli atti e delle cronache riguardanti l'abbazia della Novalesa, Volume 1 (Roma: Forzani 1898), no. 1, p. 13. Duchesne, p. 232, no. 19. 742 : Austoricus 743–? : Corbus 760 : Leopertus 804 : Adalhard 825 : Radoldus 829 : Supertus – : Evrardus 840 : AdalulfusAdalufus: Hauréau, p. 223. Duchesne, p. 232, no. 28. 855–860 : EbboThe earliest notice of Bishop Ebbo is his presence at the Synod of Valence in 855: J. Sirmond, Concilia antiqua Galliae, , Tomus III (Paris: S. Crsamoisy 1629), p. 107: "EBBO Gratianopolitanus Episcopus hanc Synodalem defin. subscr." His latest known appearance was at the election of Archbishop Ado of Vienne in 860. Hauréau, p. 224. Duchesne, p. 232, no. 29. 869–? : BernariusBernarius was a favored chaplain of King Lothar, who appointed him bishop of Grenoble in 869; the appointment was confirmed by the Emperor Louis II. In 875, he was present at the Council of Chalons, and in 876 he participated in the consecration of Archbishop Otramnus of Vienne. In 882, he was attacked and imprisoned by Bishop Adalbert of Maurienne; when he was released, he immediately went to Rome and demanded that Pope John VIII punish Adalbert. Hauréau, pp. 224–225. Duchesne, pp. 232–233, no. 30. 888–922 : IsaacIsaac: Hauréau, Gallia christiana XVI, "Instrumenta", p. 73. Duchesne, p. 233, no. 31. 944–949 : AlcheriusBishop Alcherius (Alquier) attended the concilium Trenorchianum (Tournus) in 944. Le Camus, p. 11 with note 4. 949–990 : Isarnus 990–1025 : Humbert I. d`Albon
From 1000 to 1500
1025–1035 : MallenusIn 1030, Bishop Mallenus approved the founding of the priory of Burgeto by Amadeus I, Count of Savoy. Le Camus, p. 12. Hauréau, Gallia christiana XVI, pp. 228–229. 1036–1058 : ArtaldusArtaldus was already bishop in 1036 or 1037. In August 1057, Artaldus and the diocese were the recipients of generous gifts of property from Queen Ermengard. In 1058, he was present at a consecration of a church. Le Camus, pp. 12–13. Hauréau, Gallia christiana XVI, pp. 229–230; and "Instrumenta," pp. 77–78, no. VII. 1058–10?? : Pontius ClaudusHauréau, Gallia christiana XVI, p. 230. 1070–1076 : PontiusAt the Lenten synod in Rome in February 1076, Pope Gregory VII excommunicated a number of bishops associated with the schism of Frederick Barbarossa, including Pontius of Grenoble. On 12 August 1076, Bishop Pontius confirmed the grant of several churches to the canons of the Collegiate Church of S. Laurentius de Plebe. Hauréau, Gallia christiana XVI, "Instrumenta," p. 78. Philippus Jaffe, Regesta pontificum Romanorum, , Vol I, second edition (Leipzig: Veit 1885), p. 616. Le Camus, p. 13, no. XXXVII. Hauréau, Gallia christiana XVI, p. 230. 1080–1132 : Hugh of ChâteauneufIn 1083, at the request of three clerics, Bishop Hugues created a canonicate in the church of S. Martin which he had built in the parish of S. Himerius. Hauréau, Gallia christiana XVI, pp. 230–237. "Instrumenta," pp. 78–79. 1132–1148 : Hugues 1148–1150 : NatalisNatalis was a Carthusian monk from the Chartreuse des Portes. He was elected by the cathedral Chapter, but, at the request of Abbot Bernard of Clairvaux, his election was voided by Pope Eugenius III. Le Camus, p. 14. Hauréau, Gallia christiana XVI, p. 238. Auguste Prudhomme, Histoire de Grenoble, , (Grenoble: A. Gratier, 1888), pp. 94–95. 1150–1151 : Othmar de SassenageOthmar was a Carthusian. No acts of his are known. Le Camus, p. 15. Hauréau, Gallia christiana XVI, p. 238. Prudhomme, p. 95. 1151–1163 : GeoffroyGeoffroy, a monk of the Grand Chartreuse, was a supporter of Frederick Barbarossa, and followed him in 1159 in the schism against Pope Alexander III. In return, in 1161 Barbarossa granted the bishops of Grenoble full regalian rights over the city of Grenoble, territories on both sides of the Isère River, and Saint-Donat. Pope Alexander deprived him of his bishopric in 1163. Le Camus, p. 15. Hauréau, Gallia christiana XVI, p. 239. Prudhomme, p. 95, with note 2: "Regalia nostra, prout ea melius et liberius antecessores sui usque ad ejus tempora habuerunt et que in Gratianopoli et apud Sanctum Donatum sive in toto episcopatu suo ..., predicto episcopo ejusque successoribus confirmamus;" full text in: Georg Christian Friedrich Lisch, Urkunden und Forschungen zur Geschichte des Geschlechts Behr, , Volume 5 (Stiller, 1894), pp. 60–61, no. 632. 1164–1220 : Jean de SassenageJohnnes Cassenaticus had been a monk of the Chartreuse of Reposoir (diocese of Geneva). He died in 1220. Le Camus, pp. 15–16. Hauréau, Gallia christiana XVI, pp. 239–241. Prudhomme, pp. 100–105. 1220 : GuillelmusHauréau, p. 241, says only: "Carthusianus, ut aiunt, Guillelmus, paucos annos, aut menses, ecclesiam Gratianopolitanam administravisse videtur." 1220–1223?: Pierre (I)Both Petrus and Guillaume were bishops in 1120. Petrus attended the feast of the Holy Cross on 15 September 1220. Cardinal Camus and U. Chevalier place Petrus before Guillaume. Le Camus, p. 16. So too Hauréau, p. 241. Prudhomme, p. 108, contends that Bishop Pierre died in 1221, and a vacancy of some time followed: "En 1221, à la mort de l'évêque Pierre de Seyssins qui n'avait gouverné que peu de temps l'Église de Grenoble, le siège resta vacant pendant quelque temps." Du Boys, pp. 13–14. 1223–1237 : SoffredusSoffredus had been abbot of S. Theofredus Calmeliacensis (Saint Chaffre Abbey, south of Le Puy). Bishop Soffredus and Archbishop Joannes of Vienne performed a visitation of the Chartreuse des Portes on 7 April 1225. Soffredus and Guy André the Dauphin of Vienne confirmed the privileges of the citizens of Grenoble in January 1226. He died on 23 May. Le Camus, p. 16. Du Boys, pp. 14–19. Hauréau, p. 241. Prudhomme, pp. 107–108. Eubel, Hierarchia catholica I, p. 267 (copying Gams, p. 556). 1248–1250 : Petrus 1250–1266 : Falco 1266– ? : Guillaume de SassenageOn 25 July 1266, the procurator of the Dauphin handed over to Guillaume, the son of Aimar de Cassanatico, the property of the bishops of Grenoble. Hauréau, pp. 243–246. 1301–1337 : GuillaumeGuillaume was already in office in 1310. Eubel I, p. 267, indicates that Guillaume paid the Apostolic Treasury for his bulls on 21 November 1301. 1337–1350 : Jean de ChisséChissé paid for his bulls on 23 December 1337. He died in Paris on 20 August 1350. Prudhomme, p. 207. Eubel I, p. 267. C. R. Cheney, "The Diocese of Grenoble in the Fourteenth Century," Speculum, Vol. 10, No. 2 (Apr. 1935), p. 164.