Coat of arms of the Dukedom of Mouchy in the peerage of Spain, including the mantle of a Grandee
Duke of Mouchy (Spanish: Duque de Mouchy) was a hereditary title in the Spanish nobility, accompanied by the dignity of Grandee and granted in 1747 by Ferdinand VI to Philippe de Noailles, a French military officer. After failure of the 1st Duke's successors in inheriting the dukedom through the established legal procedures, the title expired in the Kingdom of Spain. Withal, it was bestowed by Louis XVIII on the eldest son of the 1st Duke in 1817 as a title in the French peerage.
The Dukedom of Mouchy has since been held by members of a cadet branch of the Noailles family. Owing to the political system of France, a republic, the title is unrecognised (as with all titles). The title could have nonetheless been rehabilitated legally in Spain prior to 1988, when a legal reform was made prohibiting titles with more than forty years of disuse from being revived.
Prince and Duke of Poix
The founder of the branch, Philippe de Noailles (1715–1794), comte de Noailles, was a younger brother of Louis, 4th duc de Noailles. He was recognized "principe" de Poix (prince of Poix) in 1729 by King Philip V of Spain. That same year his aunt-in-law Marguerite-Thérèse Rouillé, duchesse de Richelieu, had died, leaving to Philippe the lands of the principality of Poix. It is unknown how many more subsequent holders of this title existed legally in Spain because the Spanish nobility used princely title only for the Heir to the throne, the Prince of Asturias.
The princely title was recognized by King Louis XV of France in 1765. The title became Duke of Poix in 1767 (as a life title) and in 1819 it was recognized in France as an hereditary "double" title (Prince and Duke) but usually Prince of Poix is the title for the heir.
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