Pope Gregory XV (9 January or 15 January 1554 – 8 July 1623), born Alessandro Ludovisi, was pope from 1621, succeeding Paul V on 9 February 1621.
He was born in Bologna to Pompeo Ludovisi, Count of Samoggia, and Camilla Bianchini, one of seven children.
Educated at the Collegio Romano of the Jesuits in Rome, he went to the University of Bologna to get degrees in canon and Roman law, June 1575. There is no evidence that he ever took orders: his early career was as a papal jurist in Rome. In 1612, Paul V appointed him Archbishop of Bologna and sent him in August 1616 as nuncio to the Duchy of Savoy, to mediate between Charles Emmanuel I, Duke of Savoy and Philip III of Spain in their dispute concerning the Gonzaga Marquisate of Montferrat. In September 1616, Paul created him Cardinal-Priest of Santa Maria in Traspontina. Cardinal Ludovisi remained at his see in Bologna until he went to Rome after the death of Pope Paul V to take part in the conclave in which he was chosen.
At the moment of his election, chiefly through the influence of Cardinal Borghese, at his advanced age (he was 67) and with his weak state of health he saw at once that he would need an energetic man, in whom he could place implicit confidence, to assist him in the government of the Church. His nephew Ludovico Ludovisi, a young man of 25 years, seemed to him to be the right person and, at the risk of being charged with nepotism, he created him cardinal on the third day of his pontificate. On the same day, Orazio, a brother of the pope, was put at the head of the pontifical army. The future revealed that Gregory XV was not disappointed in his nephew. The Catholic Encyclopedia allows that "Ludovico, it is true, advanced the interests of his family in every possible way, but he also used his brilliant talents and his great influence for the welfare of the Church, and was sincerely devoted to the pope." Gregory secured for the Ludovisi two dukedoms, one for his youngest brother Orazio, made a Nobile Romano and duca di Fiano, 1621, and the other, the duchy of Zagarolo, purchased from the Colonna by his nephew Ludovico Ludovisi in 1622. A second nephew, Niccolò, was made reigning prince of Piombino and Lord of the Isola d'Elba in 1634, having married the heiress, 30 March 1632.
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