After the War of the Polish Succession in 1737, the Duchy of Upper Lorraine, of which Nancy was the capital, was given to Stanislaus I Leszczyński ( in Polish,  in French), former King of Poland and father-in-law to King Louis XV of France.
In 1737, after the conflict known as the War of the Polish Succession, the Duchy of Upper Lorraine, with Nancy at its center, was bestowed upon Stanislaus I Leszczyński (in Polish, in French), a previous ruler of Poland and husband to King Louis XV's spouse.