Fiennes Cornwallis British Army officer (1831–1867) Parents Lady Jemima Mann Charles Wykeham-Martin Children Arthur Wykeham Cornwallis Fiennes Cornwallis, 1st Baron Cornwallis Helen Florence Cornwallis Caroline Vere Cornwallis Siblings Philip Wykeham-Martin Maria Wykeham-Martin Cornwallis Wykeham-Martin Partners Harriet Elizabeth Mott