Princess Izabela Maria was born to Prince Henryk Ludwik Lubomirski (15 September 1777 – 20 October 1850) and Princess Teresa Czartoryska (30 July 1785 – 31 December 1868). Through her father she was great-granddaughter of Prince Stanisław Lubomirski and through her mother she was granddaughter of Prince Józef Klemens Czartoryski.
They had five children:
Helena Sanguszko (1836–1891)
She died in 1868. She is Prince Władysław Leon Sapieha"s maternal grandmother. Prince Władysław Leon is himself Princess Zofia Sapieha"s paternal grandfather.
And Princess Zofia is Queen Mathilde of Belgium"s maternal grandmother.
So Princess Izabela Maria Lubomirska is a 6th-generation ancestor of Queen Mathilde of Belgium.
