Lady Frances Pratt and Robert Stewart, 1st Marquess of Londonderry were married for 45 years before Robert Stewart, 1st Marquess of Londonderry died, leaving behind his partner and 11 children.

They had 11 children, Frances Ann (249), Charles William (247), Elizabeth Mary (247), Caroline (245), Alexander John (243), Georgiana (241), Selina Sarah Juliana (240), Matilda Charlotte (239), Emily Jane (237), Thomas Henry (236) and Octavia (234).

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