Through his mother, he was a first cousin of King Victor Amadeus III of Sardinia and of Marie Thérèse of Savoy, Princess de Lamballe.

[2] Louis Joseph's wife Charlotte died in 1760, and as time passed, his relationship with Maria Caterina Brignole, Princess of Monaco, became serious.

By 1769, Maria had begun to set up a home in the Hôtel de Lassay, an annex of the Prince of Condé's primary residence, the Palais Bourbon.

[citation needed] In about 1774, Louis Joseph and his mistress Maria began the construction of the Hôtel de Monaco, which was to be her permanent home in Paris.

[3] Subsequently, Prince Honoré of Monaco finally realized his relationship with Maria Caterina was completely finished and thereupon turned his attention to his own love affairs.

Obtaining the rank of general, he fought in the Seven Years' War with some distinction, serving alongside his father-in-law, the Prince of Soubise.

Among other estates, Louis Joseph also inherited the famous Château de Chantilly, the main seat of the Condé line.

It was constructed in 1769 by the architect, Jean François Leroy, and was later renamed the Château d'Enghien in honour of his grandson, Louis Antoine de Bourbon, Duke of Enghien,[5] who was born at Chantilly in 1772.

He also commissioned a large garden in the English style as well as an hameau, much like the contemporary one that Queen Marie Antoinette had created at Versailles and at the Petit Trianon château.

Louis Joseph lived with his mistress Maria in France until the French Revolution, when the couple left for Germany and then Great Britain.

In addition to containing the prince's grandson, Louis-Antoine-Henri de Bourbon-Condé, duc d'Enghien, and the two sons of his cousin, the late king's brother, the comte d'Artois, the corps included many young aristocrats who eventually became leaders during the Bourbon Restoration years later.

Later, due to differences with the Austrian plan of attack, however, the Prince de Condé entered with his corps into English pay in 1795.

With the loss of its closest allies, the army transferred into the service of the Russian tsar, Paul I and was stationed in Poland, returning in 1799 to the Rhine under Alexander Suvorov.