Question: What was the date the 1464 papal conclave participant elevator became Pope whose half brother was his own cardinal-nephew ?

text: 1464 papal conclave
List of participants
Pope Pius II died on August 14 , 1464 , in Ancona during preparations for the crusade against the Ottoman Empire . At the time of his death , there were 29 living cardinals , but only 19 of them participated in the conclave : [ 1 ]
The papal conclave of 1464 (August 28-30), convened after the death of Pope Pius II, elected as his successor cardinal Pietro Barbo, who took the name Paul II.
Elector Nationality Cardinalatial Title Elevated Elevator Notes
Bessarion Greek Bishop of Frascati ; commendatario of SS . XII Apostoli 1439 , December 18 Pope Eugenius IV Dean of the Sacred College of Cardinals ; Latin Patriarch of Constantinople ; Cardinal-protector of the Orders of Basilians , Franciscans and Dominicans
Guillaume d'Estouteville , O.S.B.Cluny French Bishop of Ostia e Velletri 1439 , December 18 Pope Eugenius IV Archbishop of Rouen and administrator of Saint-Jean-de-Maurienne ; Archpriest of the patriarchal Liberian Basilica ; Cardinal-protector of the Order of Augustinians
Juan de Torquemada , O.P Castilian Bishop of Sabina 1439 , December 18 Pope Eugenius IV Bishop of Ourense
Juan Carvajal Castilian Bishop of Porto e Santa Rufina ; commendatario of S. Lucia in Septisolio 1446 , December 16 Pope Eugenius IV Bishop of Plasencia ; Cardinal-protector of Hungary
Ludovico Trevisan Venetian Priest of S. Lorenzo in Damaso 1440 , July 1 Pope Eugenius IV Camerlengo of the Holy Roman Church ; Patriarch of Aquileia ; bishop of Cava
Pietro Barbo ( elected Pope Paul II ) Venetian Priest of S. Marco 1440 , July 1 Pope Eugenius IV ( Cardinal-nephew ) Bishop of Vicenza ; Archpriest of the patriarchal Vatican Basilica
Latino Orsini Roman Priest of SS . Giovanni e Paolo 1448 , December 20 Pope Nicholas V Administrator of Bari ; Archpriest of the patriarchal Lateran Basilica
Alain de Coëtivy French Priest of S. Prassede 1448 , December 20 Pope Nicholas V Bishop of Avignon and administrator of Dol
Filippo Calandrini Bolognese Priest of S. Lorenzo in Lucina 1448 , December 20 Pope Nicholas V ( Cardinal-nephew ) Grand penitentiary ; Bishop of Bologna
Juan de Mella Castilian Priest of S. Prisca 1456 , December 17 Pope Callixtus III Bishop of Zamora
Giacomo Tebaldi Neapolitan Priest of S. Anastasia 1456 , December 17 Pope Callixtus III
Richard Olivier de Longueil French Priest of S. Eusebio 1456 , December 17 Pope Callixtus III Bishop of Coutances
Angelo Capranica Roman Priest of S. Croce in Gerusalemme 1460 , March 5 Pope Pius II Bishop of Rieti
Bartolomeo Roverella Ferrara Priest of S. Clemente 1461 , December 18 Pope Pius II Archbishop of Ravenna ; Governor of Benevento
Louis d'Albret French Priest of SS . Marcellino e Pietro 1461 , December 18 Pope Pius II Bishop of Cahors
Giacomo Ammanati-Piccolomini Siena Priest of S. Crisogono 1461 , December 18 Pope Pius II ( Cardinal-nephew ) Bishop of Pavia ; Camerlengo of the Sacred College of Cardinals
Rodrigo Borgia Catalan Deacon of S. Nicola in Carcere Tulliano ; commendatario of S. Maria in Via Lata 1456 , September 17 Pope Callixtus III ( Cardinal-nephew ) Protodeacon of the Sacred College of Cardinals ; Vice-Chancellor of the Holy Roman Church ; Administrator of Valencia
Francesco Todeschini-Piccolomini Siena Deacon of S. Eustachio 1460 , March 5 Pope Pius II ( Cardinal-nephew ) Administrator of Siena ; Legate in Rome and the Papal States
Francesco Gonzaga Mantua Deacon of S. Maria Nuova 1461 , December 18 Pope Pius II Bishop of Brixen