Philipp, Prince and Landgrave of Hesse (6 November 1896 – 25 October 1980) was head of the Electoral House of Hesse from 1940 to 1980.. He joined the Nazi Party in 1930, and, when they gained power with the appointment of Adolf Hitler as Chancellor in 1933, he became Oberpräsident of the Prussian Province of Hesse-Nassau.
Prince Donatus' father became the head of the Hesse-Cassel line on the death of his own father, Landgrave Philipp in 1980. Having also been the adopted son and heir of his distant cousin, Louis, Prince of Hesse and by Rhine , the latter's death in 1968 as the last male of the Hesse-Darmstadt branch left Moritz head of the entire House of Hesse, to which Donatus is the successor.
Jorge Luis, Landgrave de Hesse-Darmstadt: 1669: 1705 John Siegfried, Duque de Cromau y Príncipe de Eggenberg: 1644: 1713 Antonio Florián, Príncipe de Liechtenstein: 1656: 1721 Leopold Ignacius, Príncipe de Montecuccoli: 1662: 1698 John Francis, Conde de Wrbna y Freudenthal: 1643: 1705 Siegfried Christopher, Conde de Breuner? 1698