Younger brother and heir presumptive of 10th Earl of Cavan. Casualty of WWII, The Honourable Lionel Lambart served as a Captain in the Royal Navy-H.M.S. Grive. He was 67 and held the DSO. He was the son of Frederick Edward Gould Lambart, 9th Earl of Cavan, and Mary, Countess of Cavan, and the husband of Adelaide Douglas Lambart, of Sherston, Wiltshire. Find a Grave