Prince Constantine Czartoryski (1913-1989) (1913–1989) Parents Prince Olgierd Jan Pawel Antoni Czartoryski Archduchess Mechthildis of Austria Children Prince Karol Czartoryski Prince Christoph Czartoryski Siblings Princess Cecilie Czartoryska Princess Izabela Czartoryska Prince Alexander Czartoryski Partners Countess Karoline Plater-Zyberk