King Michael I of Romania was the last monarch of Romania, reigning from 1927 to 1930 and again from 1940 to 1947. He was a member of the House of Hohenzollern-Sigmaringen, a cadet branch of the House of Hohenzollern. Michael
From Wikipedia
Michael I was the last king of Romania, reigning from 20 July 1927 to 8 June 1930 and again from 6 September 1940 until his forced abdication on 30 December 1947.