Catholic Church titles Preceded byLeonardo Antonelli Cardinal-Bishop of Palestrina 2 April 1800 – 27 March 1809 Succeeded byAurelio Roverella Preceded byLuigi Valenti Gonzaga Cardinal-Bishop of Porto e Santa Rufina 27 March 1809 – 26 September 1814 Succeeded byGiuseppe Maria Doria Pamphilj Preceded byLeonardo Antonelli Bishop of Ostia 26 September 1814 – 20 April 1820 Succeeded byGiulio Maria della Somaglia Dean of the College of Cardinals 26 September 1814 – 20 April 1820

.mw-parser-output .hidden-begin{box-sizing:border-box;width:100%;padding:5px;border:none;font-size:95%}.mw-parser-output .hidden-title{font-weight:bold;line-height:1.6;text-align:left}.mw-parser-output .hidden-content{text-align:left}@media all and (max-width:500px){.mw-parser-output .hidden-begin{width:auto!important;clear:none!important;float:none!important))You can help expand this article with text translated from the corresponding article in Italian. (March 2013) Click [show] for important translation instructions. View a machine-translated version of the Italian article. Machine translation, like DeepL or Google Translate, is a useful starting point for translations, but translators must revise errors as necessary and confirm that the translation is accurate, rather than simply copy-pasting machine-translated text into the English Wikipedia. Consider adding a topic to this template: there are already 3,049 articles in the main category, and specifying|topic= will aid in categorization. Do not translate text that appears unreliable or low-quality. If possible, verify the text with references provided in the foreign-language article. You must provide copyright attribution in the edit summary accompanying your translation by providing an interlanguage link to the source of your translation. A model attribution edit summary is Content in this edit is translated from the existing Italian Wikipedia article at [[:it:Alessandro Mattei]]; see its history for attribution. You should also add the template ((Translated|it|Alessandro Mattei)) to the talk page. For more guidance, see Wikipedia:Translation.

You can help expand this article with text translated from the corresponding article in Portuguese. (March 2013) Click [show] for important translation instructions. View a machine-translated version of the Portuguese article. Machine translation, like DeepL or Google Translate, is a useful starting point for translations, but translators must revise errors as necessary and confirm that the translation is accurate, rather than simply copy-pasting machine-translated text into the English Wikipedia. Consider adding a topic to this template: there are already 1,514 articles in the main category, and specifying|topic= will aid in categorization. Do not translate text that appears unreliable or low-quality. If possible, verify the text with references provided in the foreign-language article. You must provide copyright attribution in the edit summary accompanying your translation by providing an interlanguage link to the source of your translation. A model attribution edit summary is Content in this edit is translated from the existing Portuguese Wikipedia article at [[:pt:Alessandro Mattei]]; see its history for attribution. You should also add the template ((Translated|pt|Alessandro Mattei)) to the talk page. For more guidance, see Wikipedia:Translation.

You can help expand this article with text translated from the corresponding article in French. (March 2013) Click [show] for important translation instructions. View a machine-translated version of the French article. Machine translation, like DeepL or Google Translate, is a useful starting point for translations, but translators must revise errors as necessary and confirm that the translation is accurate, rather than simply copy-pasting machine-translated text into the English Wikipedia. Consider adding a topic to this template: there are already 6,087 articles in the main category, and specifying|topic= will aid in categorization. Do not translate text that appears unreliable or low-quality. If possible, verify the text with references provided in the foreign-language article. You must provide copyright attribution in the edit summary accompanying your translation by providing an interlanguage link to the source of your translation. A model attribution edit summary is Content in this edit is translated from the existing French Wikipedia article at [[:fr:Alessandro Mattei]]; see its history for attribution. You should also add the template ((Translated|fr|Alessandro Mattei)) to the talk page. For more guidance, see Wikipedia:Translation.