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.
Third cousin twice removed of Margrethe II of Denmark and Moritz, Landgrave of Hesse. Second cousin of Charles Armstrong-Jones, Viscount Linley, Lady Margarita Armstrong-Jones, Samuel Chatto and Arthur Chatto and Alexander, Count of Schönburg-Glauchau.