Editing Pope Pius VIII (section)

==Early life==
Francesco Saverio Castiglioni was born in [[Cingoli]], [[Marche]], the third of eight children of Count Ottavio Castiglioni (1714 - 1804) and his wife Sanzia/Sancia Teresa Ghislieri. His brother Filippo Giulio Castiglioni (1774 - 1846) married and had Radegonda Nazzarena Castiglioni, born in 1810, who was married to a maternal nephew of [[Pope Pius IX]]. His baptismal name was recorded as Francesco Saverio Maria Felice. An ancestor of his was [[Pope Celestine IV]]. He studied at the Collegio Campana run by the [[Society of Jesus]] and, after that, at the [[University of Bologna]], where he earned a [[doctorate]] in [[canon law|canon]] and civil law (''[[Doctor of both laws|utroque iure]]'') in 1785. He was ordained to the priesthood in Rome on 17 December 1785.<ref name="CASTIGLIONI, Francesco Saverio (1761–1830)">{{cite web |url=http://www2.fiu.edu/~mirandas/bios1816.htm#Castiglioni |title=CASTIGLIONI, Francesco Saverio (1761–1830) |publisher=Salvador Miranda|archive-date=13 February 2018|archive-url=https://web.archive.org/web/20180213205907/http://www2.fiu.edu:80/~mirandas/bios1816.htm|access-date=2 January 2024}}</ref>

He served as the Vicar General of [[Anagni]] (1788–1790), [[Fano]] (1790–1797) and [[Ascoli Piceno]] (1797–1800).<ref name="CASTIGLIONI, Francesco Saverio (1761–1830)"/>