Niccolò Albergati in the context of Papal diplomat

Pope Nicholas V (Latin: Nicolaus V; Italian: Niccolò V; 15 November 1397 – 24 March 1455), born Tommaso Parentucelli, was head of the Catholic Church and ruler of the Papal States from 6 March 1447 until his death in March 1455. Pope Eugene IV made him a cardinal in 1446 after successful trips to Italy and Germany, and when Eugene died the next year, Parentucelli was elected in his place. He took his name Nicholas in memory of his obligations to Niccolò Albergati. He remains the most recent pope to take the pontifical name "Nicholas".

The pontificate of Nicholas saw the fall of Constantinople to the Ottoman Turks and the end of the Hundred Years' War. He responded by calling a crusade against the Ottomans, which never materialized. By the Concordat of Vienna he secured the recognition of papal rights over bishoprics and benefices. He also brought about the submission of the last of the antipopes, Felix V, and the dissolution of the Synod of Basel. A key figure in the Roman Renaissance, Nicholas sought to make Rome the home of literature and art. He strengthened fortifications, restored aqueducts, and rebuilt many churches. He ordered design plans for what would eventually be the Basilica of St. Peter.

The Archdiocese of Bologna (Latin: Archidioecesis Bononiensis; Italian: Arcidiocesi di Bologna) is a Latin Church ecclesiastical territory or archdiocese of the Catholic Church in Northern Italy. The cathedra is in the cathedral church of San Pietro, Bologna. The current archbishop is Cardinal Matteo Zuppi, who was installed in 2015.

The Archdiocese of Bologna is a metropolitan archdiocese and has three suffragan dioceses within its ecclesiastical province: the Diocese of Imola, the Diocese of Faenza-Modigliana, and the Archdiocese of Ferrara-Comacchio.