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Giovanni Doria (24 March 1573, Genoa - Palermo, Sicily, 19 October 1642), called Giannettino, the son of Giovanni Andrea Doria, 6th Prince of Melfi, and Princess Zenobia Doria del Carretto, 5th Princess of Melfi, who studied philosophy and theology in Spain being promoted to the Cardinalate at the instance of King Felipe II of Spain. Once king Philip II died, he was created cardinal deacon, aged 31, in the consistory of June 9, 1604. Granted permission to receive the sacred orders outside the Ember days, December 9, 1604. Participated in the first conclave of 1605, which elected Pope Leo XI. Participated in the second conclave of 1605, which elected Pope Paul V. Received the red hat and the deaconry of S. Adriano, December 5, 1605. Abbot commendatario of San Fruttuoso di Camogli. Elected titular archbishop of Tessalonica and named coadjutor, with right of succession, of Palermo, February 4, 1608. Consecrated, May 4, 1608, Rome, by Pope Paul V.
Succeeded to the see of Palermo, Sicily, July 5, 1608. Viceroy of Sicily and lieutenant of the king of Spain, February 8, 1610 - March 1611, July to August 1616, from August 1, 1624 to 1626 and from 1639 to June 1641.
Participated in the conclave of 1621, which elected Pope Gregory XV. Participated in the conclave of 1623, which elected Pope Urban VIII. Opted for the order of cardinal priests and the title of S. Pietro in Montorio, October 2, 1623. Discovered the relics of S. Rosalia and promoted her cultus.
He died November 19, 1642, Palermo. Buried in the chapel of S. Rosalia, in the metropolitan cathedral of Palermo.
- Bracco, Raffaele (1960). Il principe Giannandrea Doria: patriae libertatis conservator, conte di Loano, fondatore di S. Agostino. Genoa.
- Cardella, Lorenzo. Memorie storiche de' cardinali della Santa Romana Chiesa. Rome : Stamperia Pagliarini, 1793, VI, 113-115
- Gauchat,Patritium. Hierarchia Catholica Medii et Recentioris Aevi, Münster : Sumptibus et Typis Librariae Regensbergianae, 1935; reprint, Padua : Il Messagero di S. Antonio, 1960, IV, 8, 47, 50, 272 and 335.