 Filippo was also became cardinal of Bologna, cardinal Priest of San Lorenzo in Lucina, cardinal bishop of Albano (1468–1471), and finally on 30 August 1471, cardinal bishop of Porto e Santa Rufina.Calandrini participated in the conclaves of 1449, 1458, 1464, and 1471.In his account of the 1458 conclave that elected him pope, Pius II describes himself as stiffening his friend's spine to resist electing Guillaume d'Estouteville, Cardinal bishop of Ostia.