Oberleutnant Theodor Croneiss (18 December 1894 – 7 November 1942) was a World War I fighter pilot credited with five aerial victories.
World War I service.
Croneiss was one of the German pilots assigned to duty with Germany's allies, the Ottoman Empire. As such, he was assigned to "Feldflieger Abteilung 6", which was also known as the "Jasta Chanak Kale—Turkei" as early as late 1915 or early 1916. His first aerial victory came on 7 January 1916, when he downed a Farman bomber over "El Sedd-ul-Bahr". The next day, he downed a Royal Naval Air Service Voisin III LAS in the vicinity of Cape Helles. On 4 February 1916, his victory was over a reconnaissance two-seater at Baba-Tepe, off Imbros.
On 24 January 1918, Croneiss shot down a Sopwith over the Gulf of Saros. His fifth victory came on 23 May 1918, when he destroyed a Sopwith fighter. He was subsequently decorated with the Iron Cross First Class and the Knight's Cross of the House Order of Hohenzollern in August 1918.
Post World War I.
Having survived the war as an Oberleutnant, Croneiss became a sporting aviator. He became director of a flying club that sponsored Willy Messerschmitt. Croneiss piloted one of Messerschmitt's early designs, the M-21, to win the designer a 60,000 Reichsmark prize. In 1928–1929, Croneiss won the East Prussia Flying Trophy with the M-23 model. He later evolved into a test pilot for the Messerschmitt Company.
Early in 1934 SA Chief Ernst Röhm 'had chosen Theo Croneiss to replace Hermann Göring as air minister, for example, and had given him a magnificent ceremonial dagger. Croneiss ratted Röhm out to Göring. Röhm denied it...Reichsführer Himmler rewarded Croneiss with high SS rank later.' 
Theodor Jacob Croneiss died on 7 November 1942.
Sources of information.
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