Prince Yi
Emperor Gojong had nine sons, but only three princes who survived to adulthood: the second son, Crown Prince Yi Cheok; the fifth son, Yi Kang, and the seventh son, Yi Un. The Crown Prince, Yi Cheok, became Emperor Sunjong, the last monarch of the Korean Empire. Since Emperor Sunjong never had issue, his younger brother, Yi Un, the Prince Imperial Yeong became the new Imperial Crown Prince. Yi Kang (Prince Imperial Ui), might have taken the position due to his seniority but was passed over - due to the low status of Yi Kang's biological mother, Lady Chang, as well as the notorious fame of Yi Kang himself known not only domestically but also internationally. Yi Kang fathered 13 sons and 9 daughters by 14 mistresses; the number can be different based on difference sources. With an extremely wide range of historical evaluations over him — womanizer, as well as a behind-the-scene leader of the independence movement — the Japanese authorities limited the activities of the prince throughout the occupation.