Adam Jerzy Czartoryski (Polish pronunciation: [ˈadam ˈjɛʐɨ t͡ʂartɔˈrɨskʲi]; Lithuanian: Аdomas Jurgis Čartoriskis; 14 January 1770 – 15 July 1861), in English known as Adam George Czartoryski, was a Polish nobleman, statesman, diplomat and author. Czartoryski was a dedicated patron of arts and greatly contributed to the Czartoryski Collection. In 1798, he purchased one of Poland's most important national treasures – Leonardo da Vinci's Lady with an Ermine, which he brought as a gift for his mother from Italy.