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 .
Donatus, Prince and Landgrave of Hesse (Heinrich Donatus Philipp Umberto; born 17 October 1966) is the head of the House of Brabant and the German House of Hesse. He is the eldest son and successor of German aristocrat Moritz, Landgrave of Hesse , and his former wife, Princess Tatiana of Sayn-Wittgenstein-Berleburg. 
04/02/2006 · By invitation of the Landgrave Philipp of Hesse, Luther and Zwingli came to Marburg in September of 1529. They were accompanied by some of their followers, Melanchthon being among these. They were to settle their dispute about communion in which they were not successful.