Diaries and correspondence relating primarily to the diplomatic career of Sir Henry Howard and documenting his postings in China; Denmark; France; Greece; Guatemala; Hague, Netherlands; Russia; the United States; and the Vatican during World War I. Includes correspondence and diaries, interleaved with photographs, clippings, and ephemera, of his daughter, Marie Ernestine Howard von Recum (also known as Da) pertaining to her years as a teenager posted with her family to various countries, her marriage to the German aristocrat Baron Rudolf von Recum, and world events such as World War I. Subjects also include the separation of family members on different sides during World War I and World War II and the lives of interrelated British, French, and German aristocrats. Correspondents include Sir Henry Howard's wife, Lady Cecilia Riggs Howard; their children, Alice Lawrason Howard, George Howard, Henry Mowbray Howard (also known as Pompey), and Janet Madeleine Cecilia Howard (also known as Jessie); Franz von Recum; Alice L. Riggs; Jane Agnes Riggs; and other members of the Howard, Riggs, and von Recum families.