Question: On what date was the nephew of Pope Eugenius IV elevated the 1458 papal conclave ?

text: 1458 papal conclave
List of participants
At the time of Callixtus ' death , there were 27 living cardinals , of whom 19 were in Rome , but on August 14 Cardinal Domenico Capranica , archpriest of the College , unexpectedly died . Participating in the conclave were 18 out of the 26 members of the Sacred College : [ 3 ]
The papal conclave of 1458 (August 16-19), convened after the death of Pope Callixtus III, elected as his successor Cardinal Enea Silvio Piccolomini who took the name Pius II.
Elector Nationality Cardinalatial Title Elevated Elevator Notes
Giorgio Fieschi ( called Cardinal Fieschi ) Genovese Bishop of Ostia e Velletri 1439 , December 18 Pope Eugenius IV Dean of the Sacred College of Cardinals ; bishop of Albenga
Isidore of Kiev ( Cardinal of Ruthenia ) Greek Bishop of Sabina ; administrator of SS . Marcellino e Pietro 1439 , December 18 Pope Eugenius IV Latin Patriarch of Constantinople ; administrator of the see of Nicosia
Bessarion ( Cardinal of Nicea ) Greek Bishop of Frascati ; commendatario of SS . XII Apostoli 1439 , December 18 Pope Eugenius IV Titular archbishop of Nicea and Tebe ; administrator of the sees of Mazara del Vallo and Pamplona ; Cardinal-protector of the Order of Basilians
Guillaume d'Estouteville , O.S.B.Cluny ( Cardinal of Rouen ) French Priest of SS . Martino e Silvestro 1439 , December 18 Pope Eugenius IV Archbishop of Rouen and administrator of the see of Saint-Jean-de-Maurienne ; Archpriest of the patriarchal Liberian Basilica ; Cardinal-protector of the Order of Augustinians
Juan de Torquemada , O.P . ( Cardinal of S. Sisto ) Castilian Priest of S. Maria in Trastevere 1439 , December 18 Pope Eugenius IV Administrator of the suburbicarian see of Palestrina ; abbot commendatario of Subiaco
Pietro Barbo ( Cardinal of S. Marco ) Venetian Priest of S. Marco 1440 , July 1 Pope Eugenius IV ( Cardinal-nephew ) Bishop of Vicenza ; Archpriest of the patriarchal Vatican Basilica
Antonio de la Cerda ( Cardinal of Messina ) Catalan Priest of S. Lucia in Septisolio 1448 , February 16 Pope Nicholas V Bishop of Lerida ; administrator of the see of Giovinazzo
Latino Orsini ( Cardinal Orsini ) Roman Priest of SS . Giovanni e Paolo 1448 , December 20 Pope Nicholas V Administrator of the see of Bari ; Archpriest of the patriarchal Lateran Basilica
Alain de Coëtivy ( Cardinal of Avignon ) French Priest of S. Prassede 1448 , December 20 Pope Nicholas V Bishop of Avignon and administrator of the sees of Nîmes and Dol
Filippo Calandrini ( Cardinal of Bologna ) Bolognese Priest of S. Lorenzo in Lucina 1448 , December 20 Pope Nicholas V ( Cardinal-nephew ) Bishop of Bologna
Luis Juan del Mila y Borja ( Cardinal of Segorbe ) Catalan Priest of SS . IV Coronati 1456 , February 20 Pope Callixtus III ( Cardinal-nephew ) Administrator of the see of Segorbe ; Legate in Bologna
Juan de Mella ( Cardinal of Zamora ) Castilian Priest of S. Prisca 1456 , December 17 Pope Callixtus III Bishop of Zamora
Giovanni Castiglione ( Cardinal of Pavia ) Milanese Priest of S. Clemente 1456 , December 17 Pope Callixtus III Bishop of Pavia
Enea Silvio Piccolomini ( Cardinal of Siena ) Siena Priest of S. Sabina 1456 , December 17 Pope Callixtus III Bishop of Siena and bishop of Warmia
Giacomo Tebaldi ( Cardinal of S. Anastasia ) Neapolitan Priest of S. Anastasia 1456 , December 17 Pope Callixtus III Archbishop of Naples ; Camerlengo of the Sacred College of Cardinals
Prospero Colonna ( Cardinal Colonna ) Roman Deacon of S. Giorgio in Velabro 1426 , May 24 Pope Martin V ( cardinal-nephew ) Protodeacon of the Sacred College of Cardinals
Jaime de Portugal ( Cardinal of Portugal ) Portuguese Deacon of S. Eustachio 1456 , February 20 Pope Callixtus III Archbishop of Lisbon ; administrator of the see of Paphos
Rodrigo Borgia ( Cardinal Vicechancellor ) Catalan Deacon of S. Nicola in Carcere ; commendatario of S. Maria in Via Lata 1456 , February 20 Pope Callixtus III ( Cardinal-nephew ) Vice-Chancellor of the Holy Roman Church ; Administrator of Valencia ; generalissimo of the papal troops