Lady Catherine Bligh (died 1812) (1774–1812) Parents Mary Stoyte John Bligh, 3rd Earl of Darnley Children Frederick Stewart, 4th Marquess of Londonderry Siblings Lady Theodosia Bligh Edward Bligh unknown daughter Bligh John Bligh, 4th Earl of Darnley unknown daughter Bligh William Bligh Partners Charles Vane, 3rd Marquess of Londonderry