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Luigi Braschi-Onesti | |
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| Duke of Nemi, Prince of Rocca Sinibalda, Marquess of Belmonte Sabino, Count of Falcino, Marquess and Count Braschi-Onesti, Grandee of Spain 1st Class, Prince of the Holy Roman Empire | |
| Born | 19 July 1745Cesena, Papal States |
| Died | (1816-02-09)February 9, 1816Rome, Papal States |
| Noble family | Braschi-Onesti |
| Spouse | Costanza Falconieri |
| Father | Girolamo Onesti |
| Mother | Elena Giulia Francesca Braschi |
Don Luigi Braschi-Onesti (19 July 1745 – 9 February 1816), 1st Duke of Nemi, 1st Prince of Rocca Sinibalda, 1st Marquess of Belmonte Sabino, Count of Falcino, Marquess and Count Braschi-Onesti, Grandee of Spain 1st Class, 1st Prince of the Holy Roman Empire, was a nephew of Pope Pius VI, who granted him his Dukedom, Marquessdom and Countdom.
Son of Girolamo Onesti (Cesena, 22 February 1708 - Cesena, 3 April 1790), Marquess and Count Onesti, and wife (23 December 1737) Elena Giulia Francesca Braschi of the Counts of Falcino (Cesena, 28 July 1719 - 16 January 1792), Pope Pius VI's sister, his younger brothers were Filippo Braschi-Onesti and Romoaldo Braschi-Onesti, Cardinal (the penultimate cardinal-nephew) and Camerlengo. His sisters were Anna Teresa Braschi-Onesti, Fulvia Braschi-Onesti, Nun under the name Benedetta, and Marianna Braschi-Onesti (1742), who married Giovanni Bandi. His step-great-grandmother was Countess Cornelia Zangari Bandi. His granduncle was Cardinal Giovanni Carlo Bandi.[1]
On Luigi's marriage, arranged and celebrated by his uncle, to the richest lady of the Falconieri family, Costanza Falconieri, later Dame of the Royal Order of Noble Ladies of Queen Maria Luisa, born in Rome around 1764 or in 1767, daughter of Mario Falconieri, Marquess Falconieri, and wife Giulia Mellini, at the Sistine Chapel in Rome on 31 May or 9 June 1781, he was adopted with his brother and was granted permission and necessary funds by Pius to build Palazzo Braschi off Piazza Navona, and from 1787 and 1795 he built another neoclassical Palazzo Braschi at Terracina, as a private residence for his uncle.
The Frangipani family possessed the Marquessdom of Nemi, which was bought by Pope Pius VI for his nephew Luigi, whom he cumulated with honours and riches, as well as his Cardinal brother. He was created 1st Prince of the Holy Roman Empire by Joseph II, Holy Roman Emperor, in 1782, Grandee of Spain 1st Class by Charles III of Spain and 1st Duke of Nemi, 1st Marquess of Belmonte Sabino and Count of Falcino by his uncle Pope Pius VI on 14 November 1786 and Knight of the Order of Saints Maurice and Lazarus by Victor Amadeus III of Sardinia and Knight of the Order of the Holy Spirit by Louis XVI of France.
On 21 January 1782 Marquess Amanzio Lepri left in his will all his fiefdoms, including Rocca Sinibalda, to Pope Pius VI with the condition that he left as his heir his nephew Luigi Braschi-Onesti. In 1802, Marianna Lepri, Amanzio's niece, challenged the validity of the claim of the will and promoted a lawsuit against the Braschi, with a process authorized by Pius VI, and concluded a compromise with which the inheritance is divided between Luigi, the Pope's nephew - who received part of the fiefdom -, and Marianna Lepri, who received the castle. The Treaty of Concord was laid out on 16 October 1802, with the approval of the Pope. Thus, after 20 years of usurpation by Luigi Braschi-Onesti, the castle passed to Marianna Lepri. During the aforementioned 20 years, Luigi Braschi-Onesti also boasted the title of Prince of Rocca Sinibalda. It is known that, around 1785, Vincenzo Monti was a guest of the castle. In 1816, the castle was property of Alessandro Curti-Lepri, father of Luigi's daughter-in-law, while in 1843 the owner was Marquess Ferdinando Lorenzana.[2]
He was a Senator of Bologna.[3]
The construction on his Rome palazzo was suspended from 15 February 1798 to 1802, during the Roman Republic and the Napoleonic occupation of the city, when the French occupied the house and confiscated the recently acquired antiquities Braschi-Onesti had housed there. Braschi-Onesti moved into the palazzo in 17 May 1809, when Napoleon declared Rome an imperial city within the First French Empire, and was declared Sindaco of Rome between 17 May 1809 and 1814, though the palazzo was still unfinished at his death seven years later.
Between 1814 and 9 February 1816 he was the 2nd Commander of the Papal Noble Guard.
His children were:

Some of his antiquities were purchased by the Crown Prince of Bavaria, later King Ludwig I and are conserved at the Glyptothek that he built in Munich.
The Braschi collection included: