The article deals withthe visit of the last Korean crown prince, Yi Ŭn (Gin Ri), and his Japanese spouse, Masako Ri (Yi Pangja), to Prague in December 1927. It is based on the so-far unknown sources of the Office of the President of the Republic (1927), Czech newspapers (October-December 1927), Korean internet sources and relevant works on Korean history. Their visit to Czechoslovakia was part of their extended visit to several European countries. In spite of its private character and the non-pursuit of diplomatic aims, the couple experienced a high level welcome. They were granted an audience with the Presiden of the Czechoslovak republic, T. G. Masaryk, during which they met the leading representatives of the Czechoslovak government and army (the minister of foreign affairs, E. Beneš, the promienent commanders of the Czechoslovak Legions in Siberia and Vladivostok in 1920). As part of the reception, Yi Ŭn was bestowed with the Order of the White Lion, the highest Czechoslovak award. The article provides a breif overview of Korean history from 1876 onwards and expalins the methods used by the Japanese to make the last Korean prince - the possible Korean emperor - their army officer., Zdenka Klöslová., and Obsahuje bibliografii