The House of Czartoryski (feminine form: Czartoryska, plural: Czartoryscy; ) is a Polish princely family of Lithuanian-Ruthenian origin, also known as the Familia. The family, which derived their kin from the Gediminids dynasty, by the mid-17th century had split into two branches, based in the Klevan Castle and the Korets Castle, respectively. They used the Czartoryski coat of arms and were a noble family of the Polish–Lithuanian Commonwealth in the 18th century.
The Czartoryski and the Potocki were the two most influential aristocratic families of the last decades of the Polish–Lithuanian Commonwealth (1569–1795).
thumb|right|Czartoryski family vault in [[Sieniawa]]
thumb|upright|Kazimierz Czartoryski, founder of the "[[Familia (political party)|Familia"]]
thumb|upright|[[Adam Kazimierz Czartoryski; portrait by Józef Peszka]]
History
The Czartoryski family is of Lithuanian descent from Ruthenia. Their ancestor, a grandson of Gediminas, the Grand Duke of Lithuania, became known with his baptismal name Constantine ( 1330−1390) - he became a Prince of Chortoryisk in Volhynia. One of his sons, Vasyli Chortoryiski (Ukrainian: Чарторийський; 1375–1416), was granted an estate in Volhynia in 1393, and his three sons John, Alexander and Michael (c. 1400–1489) are considered the progenitors of the family. The founding members were culturally Ruthenian and Eastern Orthodox; they converted to Roman Catholicism and were Polonized during the 16th century.