STANISLAUS PONIATOWSKI (1757-1833), son of Casimir, shared in the aggrandisement of the family during the reign of Stanislaus II., becoming grand treasurer of Lithuania, starost of Podolia and lieutenant-general of the royal army. In 1793 he settled in Vienna, and subsequently in Rome, where he made a magnificent collection of antique gems in his house on the Via Flaminia. This collection was sold at Christie's in London in May 1839. He died in Florence on the 13th of February 1833, and with him the Polish and Austrian honours became extinct.
His natural, but recognized, son, JOSEPH MICHAEL XAVTER FRANCIS JOHN PONIATOWSKI (1816-1873), w s born at Rome and in 1847 was naturalized as a Tuscan subject. He received the title of prince in Tuscany (1847) and in Austria (1850). He had studied music under Ceccherini at Florence, and wrote numerous operas, in the first of which, Giovanni di Procida, he sang the title rdle himself at Lucca in 1838. He represented the court of Tuscany in Paris from 1848, and he was made a senator by Napoleon III., whom he followed to England in 1871. His last opera, Gelmina, was produced at Covent Garden in 1872. He died on the 3rd of July 1873, and was buried at Chislehurst. His son, Prince Stanislaus Augustus, married and settled in Paris. He was equerry to Napoleon III., and died in January 1908.
Note - this article incorporates content from Encyclopaedia Britannica, Eleventh Edition, (1910-1911)