Duke of Sueca is a title of Spanish nobility, Grandee of Spain 1st class.

King Charles IV also granted to Manuel Godoy the Duchy of Alcudia, the Barony of Mascalbó and the title of Prince of the Peace.

It seems that he was also "Marqués de Álvarez", as it is named in different documents, although it is a title that was never used by his successors, nor has anyone attempted to rehabilitate it, nor is it stated in the Cast of Greatness and Titles Nobiliarios Españoles or in the Directory of the Diputación de la Grandeza.

His son succeeded him: IV Duke: Camilo Rúspoli y Caro, Alvarez de Toledo y Caro (1904-1975), who reunites all the titles, both of Manuel Godoy, and of the Infanta Maria Teresa, by which he became the IV Duke of Sueca, IV Duke of la Alcudia, XVIII Count of Chinchón, and VI Marquess of Boadilla del Monte.

He married Maria Alvarez de las Asturias Bohorques and Rumeu, of the Dukes of Gor.