Prince Kazimierz Poniatowski (15 September 1721 – 13 April 1800) was a Polish Szlachcic, podkomorzy wielki koronny (1742–1773), Lieutenant general of the Royal Polish forces, generał wojsk koronnych. Knight of the Order of the White Eagle, awarded on 3 August 1744 in Warsaw. He was the eldest of eight surviving children of Princess Konstancja Czartoryska and of Count Stanisław Poniatowski, Ciołek coat of arms, Castellan of Kraków. His siblings were: On 21 January 1751 he married Apollonia Ustrzycka (17 January 1736 – 1814), by whom he had one son and two daughters: