Princess Sybille Margaret Adelheid Louise of Hesse (1877–1925); married Friedrich Alexander Henry Robert Carl Albert, Baron von Vincke (divorced 1923). Elector of Hesse [ edit ] He is important dynastically as a candidate for both the headship of the Hesse-Kassel dynasty (through his father) and for the Danish throne (through his mother).
Landgrave Alexander Frederick of Hesse abdicated as the head of the House of Hesse on 16 March 1925, and was succeeded by Frederick Charles, his younger brother. At Frederick's death, his eldest surviving son, Philipp, succeeded him as head.
Second cousin, once removed of Alexander Windsor, Earl of Ulster, Lady Davina Lewis, Lady Rose, George Windsor, Earl of St Andrews, Lady Helen Taylor, Lord Nicholas Windsor, James Ogilvy, Marina Ogilvy, Lord Frederick Windsor and Lady Gabriella Windsor, Queen Sofía of Spain, Constantine II of Greece, Michael I of Romania and Norton Knatchbull, 3rd Earl Mountbatten of Burma.