In what year was the man under whose command the 1st U-boat Flotilla was founded born?
Karl Dönitz Karl Dönitz (sometimes spelt Doenitz) (] ; 16 September 1891 – 24 December 1980) was a German admiral who played a major role in the naval history of World War II. Dönitz briefly succeeded Adolf Hitler as the head of state of Germany.
Heinrich Bleichrodt Heinrich Bleichrodt (21 October 1909 – 9 January 1977) was one of the most successful German U-boat commanders of the Second World War. From October 1939 until retiring from front line service in December 1943, he was credited with sinking 25 ships for a total of  gross register tons (GRT) . For this he received the Knight's Cross of the Iron Cross with Oak Leaves, among other commendations. He earned the nickname "Ajax" during his time with the U-boats.