Pope Gregory X (1271–1276) create five cardinals in one consistory.Eubel, p. 9.
Consistory of 3 June 1273 Pedro Julião, archbishop of Braga — cardinal-bishop of Frascati, later elected Pope John XXI (20 September 1276), † 20 May 1277 Vicedomino de Vicedominis, nephew of the pope and archbishop of Aix — cardinal-bishop of Palestrina, † 6 September 1276 Bonaventure, O.F.M., Minister General of the Order of Friars Minor — cardinal-bishop of Albano, † 15 July 1274 Pierre de Tarentaise, O.P., archbishop of Lyon — cardinal-bishop of Ostia e Velletri, then (21 January 1276) Pope Innocent V † 22 June 1276 Bertrand de Saint-Martin, O.S.B., archbishop of Arles — cardinal-bishop of Sabina, † 28 March 1278 (?)
"Presumed cardinals" According to Cardellapp. 8-9 in 1275 Gregory X celebrated the second consistory for the creation of two additional cardinals, but modern scholars have established that this never happened:Stapper, pp. 35-36 not. 3; and Sternfeld, pp. 200-201 not. 35; see also Eubel, p. 9 not. 3
"Presumed" cardinal Alleged cardinalate NotesGiovanni Visconti, nephew of the popeCardinal-bishop of Sabina 1275–1277/78. According to Cardella, in 1276 he was named judge in the case concerning the translation of bishop Giovanni of Potenza to the archbishopric of Monreale, postulated by the cathedral chapter of MonrealeCardella, p. 8.The existence of this cardinal is not possible at that time because the suburbicarian see of Sabina was occupied by Bertrand de Saint-Martin from 1273 until 1278Stapper, pp. 35-36 not. 3; Sternfeld, pp. 200-201 not. 35; Eubel, p. 9 and 38. The document of John XXI concerning the postulation of bishop Giovanni of Potenza to the see of Monreale actually refers to cardinal Bertrand and even explicitly calls him by name!Stapper, pp. 35-36 not. 3. Cardinal Bertrand is mentioned also in some other documents from the register of Pope John XXI.Teobaldo de Ceccano, O.Cist., abbot of FossanovaCardinal-priest 1275–1279, papal legate on several occasionsCardella, pp. 8-9There is no documentary proof of his promotion to the cardinalate; contemporary sources call him only abbot of FossanovaStapper, pp. 35-36 not. 3; Sternfeld, pp. 200-201 not. 35; cfr. Eubel, p. 9 not. 3
Apart from the lack of any documentary proof attesting the promotion of these individuals (in the case of Visconti even of his existence), the contemporary chronicler Salimbene explicitly says that the consistory of 1273 was the only single promotion of new cardinals in the pontificate of Gregory X, and mentions only five cardinals promoted at that time.Monumenta Germaniae Historica, Scriptores 32, pp. 495-496; cfr. Stapper, p. 35 not. 3.
Notes
Sources
Konrad Eubel: Hierarchia Catholica Medii Aevi, vol. 1, Münster 1913 Richard Stapper: Papst Johannes XXI, Kirchengeschichtliche Studien, Münster 1898 Richard Sternfeld, Der Kardinal Johann Gaetan Orsini (Papst Nikolaus III.) 1244-1277, Berlin 1905 Lorenzo Cardella: Memorie storiche de' cardinali della Santa Romana Chiesa, vol. 2, Rome 1793