Prince Kazimierz Poniatowski (15 September 1721 β 13 April 1800) was a Polish Szlachcic, podkomorzy wielki koronny (1742β1773), Lieutenant general of the Royal Polish forces, general 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 Stanislaw Poniatowski, Ciolek coat of arms, Castellan of KrakΓ³w.
His siblings were:
Canon Franciszek Poniatowski (1723-1749), canon of Krakow Cathedral who suffered from Epilepsy
Aleksander Poniatowski (1725-1744), officer killed in the Rhineland-Palatinate during the War of the Austrian Succession
Ludwika Zamoyska (1728-1804)
Izabella Branicka (1730-1808)
Stanislaw Antoni Poniatowski (1732-1798), King of Poland and Grand duke of Lithuania (1764-1795)
Andrzej Poniatowski (1734β1773), an Austrian Feldmarschall
Michal Jerzy Poniatowski (1736β94), Primate of PolandHe was a great-grandson of the poet, courtier and alleged traitor, Jan Andrzej Morsztyn and through his great-grandmother, Catherine Gordon, lady-in-waiting to Queen Marie Louise Gonzaga, he was related to the House of Stuart and thereby connected to the leading families of Scotland, Spain and France.
In the 18th-century the Poniatowski family had achieved high rank among the Polish nobility (szlachta).
He was created Prince by his brother, King Stanislaw II August Poniatowski on 4 December 1764.
After the First Partition of Poland (1772), he sold off his Podkomorzy title, played no further part in politics and joined the "high life".
He was considered a model of a "wastrel".On 21 January 1751 he married Apollonia Ustrzycka (17 January 1736 β 1814), by whom he had one son and two daughters:
Prince Stanislaw Poniatowski (1754β1833)
Princess Katarzyna Poniatowska (25 August 1756 β March 1773)
Princess Konstancja Poniatowska (2 March 1759 β 1830), who on 4 April 1775 married Ludwik Tyszkiewicz (1748 β 1808), hetman polny litewski i marszalek wielki litewski