He was also granted the title of Duque de Grimaldi, 8 April 1777, by King Charles III of Spain, a.k.a. former King Charles VII of Naples, for his services to the Spanish Crown.
On 8 April 1777, King Charles III of Spain, also known as former King Charles VII of Naples, bestowed upon him the title of Duque de Grimaldi for his service to the Spanish Crown.