by Susan Flantzer
© Unofficial Royalty 2022

Honoré Charles Anne Grimaldi was born in Paris, France on May 17, 1758. He was the elder of the two sons of Honoré III, Prince of Monaco and Maria Caterina Brignole who came from a Republic of Genoa (now in Italy) noble family. Honoré’s paternal grandparents were Louise-Hippolyte, Sovereign Princess of Monaco for ten months before her death from smallpox, and Jacques I, briefly the Sovereign Prince of Monaco, born Jacques François Leonor Goyon de Matignon. His maternal grandparents were Giuseppe Brignole, Marquis di Groppoli, the Ambassador to France from the Republic of Genoa, now in Italy, and Maria Anna Balbi.

Honoré IV had one younger brother:

• Prince Joseph of Monaco, Regent of Monaco (1763 – 1816), married (1) Marie Thérèse de Choiseul, had three children, Marie Thérèse was guillotined during the French Revolution (2) Frances Margaret Powell, no children

Honoré IV’s parents had issues with their marriage. Honoré III and Maria Caterina initially lived in Monaco but by 1760, Honoré III was dissatisfied with his life there, and returned to France without his wife, spending time with his mistresses at his French homes. Eventually, Maria Caterina was allowed to come to France. However, Honoré III continued his affairs and Maria Caterina began an affair, that would become long-term, with Louis Joseph de Bourbon, Prince of Condé. In 1770, Louis Joseph used his influence to obtain a legal separation for Maria Caterina from Honoré III and the right to manage her own finances. Honoré III finally realized his relationship with Maria Caterina was over and eventually accepted Maria Caterina’s relationship with Louis Joseph de Bourbon, Prince of Condé. Three years after Honoré III’s death in 1798, Maria Caterina and Louis Joseph were married but their marriage was kept secret for ten years.

Honoré IV and his brother Joseph grew up mostly in France, living in homes inherited from their paternal grandfather Jacques III Goyon de Matignon, Count of Thorigny: a Paris mansion, the Hôtel de Matignon, now the official residence of the Prime Minister of France, and the Château des Matignon (link in French) in Torigni-sur-Vire in Normandy, France. In 1641, during the reign of Honoré II, Monaco became a French protectorate, and the Princes of Monaco became vassals of the Kings of France while remaining sovereign princes. Many successive Princes of Monaco and their families spent most of their lives in France and intermarried with French and Italian noble families.

Honoré III arranged a marriage for his son Honoré (IV) to Louise d’Aumont, Duchess of Mazarin, Duchess of Mayenne, Duchess of Meilleraye, the only child of Louis Marie Guy d’Aumont de Rochebaron, Duke of Aumont (1732 – 1799) and Louise-Jeanne de Durfort, Duchess of Mazarin, Duchess of Mayenne, Duchess of Meilleraye (1735 – 1781). Through her mother, Louise was the great-great-great-granddaughter of Hortense Mancini, Duchess of Mazarin, Duchess of Mayenne, Duchess of Meilleraye, the mistress of King Charles II of England, and one of the two heirs of her uncle Cardinal Jules Mazarin, the First Minister of King Louis XIV of France. Louise was the heir of Hortense Mancini’s titles and the Mazarin family wealth. Therefore, a marriage to Louise came with a large dowry and the prospect of a fortune. Honoré (IV) and Louise married on July 15, 1777. 

The marriage did produce two sons, both Sovereign Princes of Monaco:

• Honoré V, Prince of Monaco (1778 – 1841), unmarried
• Florestan, Prince of Monaco (1785 – 1856), married Maria Caroline Gibert de Lametz, had one son and one daughter

The French Revolution had dire consequences for the Grimaldi family. In January 1793, Honoré III, Prince of Monaco was officially declared deposed and France annexed the Principality of Monaco. Members of the former ruling Grimaldi dynasty lost all aristocratic privileges in France, were dispossessed of their French property, and became French citizens.  During the Reign of Terror, in September 1793, Honoré (IV), his wife Louise, their son Florestan, and Honoré (IV)’s father Honoré III were arrested and imprisoned in Paris as enemies of the people. Louise and her son Florestan were rescued by a family doctor who forged release papers and hid them in his home until the Reign of Terror was over. The wife of Honoré IV’s brother Joseph was not as lucky. Joseph spent most of his time abroad negotiating foreign loans, making him a suspect of counter-revolutionary activities. When Joseph did become involved in a counter-revolution, his wife Marie Thérèse was arrested in the absence of her husband, condemned to death, and guillotined in 1794, one of the last victims before the end of the Reign of Terror.

In October 1794, Honoré III and Honoré (IV) were released from prison. Honoré III never recovered from his imprisonment and died in Paris on March 21, 1795, at the age of 74, but his burial place is unknown. Honoré IV, whose chronic ill health had been worsened by imprisonment, would have become Prince of Monaco but Monaco was no longer a sovereign monarchy. However, Honoré IV’s family properties in France were returned to him but they were in poor condition and all of the contents were gone.

In 1794, while Honoré IV was still in prison, Louise had given birth to an illegitimate daughter Amélie Céleste Erodore d’Aumont. The father of the child is believed to have been Antoine de Montazet, Archbishop of Lyon. After Honoré IV’s release from prison, Louise and Honoré IV’s marriage became unhappy and the couple separated. In 1798, Louise divorced Honoré IV, giving Louise sole access to her fortune.

In 1804, Napoleon crowned himself Emperor of the French. Honoré IV could not adapt to the new French society and remained an outsider. Because of a lack of funds, he needed to sell his family’s Paris and Normandy homes. Surprisingly, Honoré IV’s health improved and he joined the French Army. He was wounded during Napoleon’s Russian Campaign, lost the use of one arm, and was sent back to Paris.

After Napoleon’s defeat in 1814 and the Bourbon Restoration which saw Louis XVIII, a younger brother of the beheaded King Louis XVI, become King of France, Florestan’s uncle Joseph petitioned King Louis XVIII to restore the Principality of Monaco to the Grimaldi family. Florestan’s father Honoré IV finally became Sovereign Prince of Monaco in 1814. The independence of Monaco lasted for only one year. In 1815, the Congress of Vienna, an international diplomatic conference that reconstituted the European political order after the downfall of  Napoleon I, declared that Monaco would be a protectorate of the Kingdom of Sardinia.

By the time Honoré IV became the Sovereign Prince of Monaco, his physical condition had worsened and he was now paralyzed on one side of his body. Because of his condition, a regency was established to rule in his name. Honoré IV’s brother Joseph was regent from 1814 -1815 and then Florestan’s brother Honoré V served as regent until his father’s death in 1819 when he succeeded him as Honoré V, Prince of Monaco.

Honoré IV, Prince of Monaco died in Paris, France on February 16, 1819, aged 60. He was buried at the Church of Saint Nicholas in Monaco. During the late 19th century, a new and larger church, the Cathedral of Monaco, was built on the site of the Church of Saint Nicholas. The original church was demolished in 1874 but the current cathedral was built over the areas of the previous church and the old burial site so that the sovereign princes and consorts originally buried at the Church of Saint Nicholas are now buried in the Cathedral of Monaco.

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Works Cited

• Edwards, Anne, 2017. The Grimaldis of Monaco. Blue Ridge Summit: Lyons Press.
• En.wikipedia.org. 2022. Honoré IV, Prince of Monaco – Wikipedia. [online] Available at: <https://en.wikipedia.org/wiki/Honor%C3%A9_IV,_Prince_of_Monaco> [Accessed 22 March 2022].
• En.wikipedia.org. 2022. Louise d’Aumont – Wikipedia. [online] Available at: <https://en.wikipedia.org/wiki/Louise_d%27Aumont> [Accessed 22 March 2022].
• Flantzer, Susan, 2022. Honoré III, Prince of Monaco. [online] Unofficial Royalty. Available at: <https://www.unofficialroyalty.com/honore-iii-prince-of-monaco/> [Accessed 22 March 2022].
• Flantzer, Susan, 2022. Maria Caterina Brignole, Princess of Monaco. [online] Unofficial Royalty. Available at: <https://www.unofficialroyalty.com/maria-caterina-brignole-princess-of-monaco/> [Accessed 22 March 2022].
• Fr.wikipedia.org. 2022. Honoré IV (prince de Monaco) — Wikipédia. [online] Available at: <https://fr.wikipedia.org/wiki/Honor%C3%A9_IV_(prince_de_Monaco)> [Accessed 22 March 2022].
• Fr.wikipedia.org. 2022. Louise d’Aumont — Wikipédia. [online] Available at: <https://fr.wikipedia.org/wiki/Louise_d%27Aumont> [Accessed 22 March 2022].