Honor Wellesley Montagu - from her Facebook account. She is the second child of Princess Antonia of Prussia and Arthur Wellesley, Marquess of Douro. Maternal grandparents are Prince Frederick of Prussia (son of Crown Prince Wilhelm, who was the son of Kaiser Wilhelm II) and Lady Brigid Guiness. Honor is married to Orlando Montagu, and has two children, Walter b. 2005 and Nancy, b. 2007.