Date of birth:

October 28th, 1909 (Seoul, Korea)

Date of death:

December 21st, 1990 (Yono/Saitama Prefecture, Japan)

Nationality:

Korean (1910-1944, Colony)

Crown Prince Yi Geon (이건) or Kenichi Momoyama, member of the Imperial Korean Family, was a cavalry officer in the Imperial Japanese Army. He was naturalized as a Japanese citizen in 1950 after he lost royal status by order of the SCAP in October 1947.

Promotions:
August 1933: Lieutenant (Chūi)
1 August 1936: Captain (Tai-i)
1 August 1940: Major (Shōsa)
1 March 1943: Lieutenant Colonel (Chūsa)
?: Colonel (Taisa)

Career:
13 September 1939 - 1945: Imperial Japanese Army Research Department

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• Photo: Wikimedia Commons
  
• - Printing Department of the Ministry of Finance (October 28, 1929). "Official Communications and Ordinance" (in Japanese)
  - Daily Newspaper. October 26, 1930 "The Hall of Fame" (in Japanese)
  - Daily Newspaper. July 29, 1936 (in Japanese)
  - Daily Newspaper. November 5, 1940 (in Japanese)
  - Lieutenant (in Japanese)
  - Daily Newspaper. March 2, 1943 (in Japanese)
  - Notice of the Ministry of Justice No. 165, "Official Gazette" (March 1, 1975), Printing Bureau, Tokyo. 1955, page 5