The House of Czartoryski 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

Princess Konstancja Czartoryska was a Polish-Lithuanian noblewoman and the mother of King Stanisław II August of Poland. She played a political role as a driving force within the Familia.