A de Vallière 24-pounder gun bearing the inscription "Louis Charles de Bourbon, Comte d'Eu, Duc d'Aumale".
Like his siblings he remained unmarried and childless all his life. On his father's death in 1736 he gained the title of Duke of Aumale. He was also made Grand Master of the Artillery. a post that his father had also held.
His elder brother was their father's main heir, but when he was killed in a duel in 1755 Louis Charles inherited his brother's estate. He was given his brother's governorship of Languedoc and inherited his brother's many châteaux.
Like his elder brother he was little seen at court and preferred to hunt on his estate of the Château d'Anet.
In March 1762 he exchanged with Louis XV the principality of the Dombes for the dukedoms of Gisors and the estates of Gretz-Armainvilliers and Pontcarré.
^This payment was never made as a result of the death of Louis XV in 1774; the lands were given back to Louis Charles and the deal was disregarded by Louis XVI. They were later inherited by the Duke of Penthièvre