Prince Hubertus of Prussia (1909-1950) was the 3rd son of Wilhelm, the last Crown Prince of Germany. Hubertus joined the army in 1934 and participated in the Invasion of Poland in 1939. One year later he was dismissed from the army by Hitler's orders. He married Baroness Maria von Humboldt-Dachroeden (1916-2003) in 1941. They divorced in 1943. On 5 June of the same year, he married Princess Magdalena Reuß of Köstritz (1920–2009).