According to the Japan-Korea Annexation Treaty and the related imperial edict, 'His Majesty the Emperor of Korea, His Majesty the Retired Emperor, His Majesty the Crown Prince and their empresses and descendents' were called the royal family, and the head of the Lee royal family was also called a king, but the king of the imperial family was different from the king of the royal family.
なお、韓国併合条約及び関連する詔書により、「韓国皇帝陛下太皇帝陛下皇太子殿下並其ノ后妃及後裔」に該当する者を王族とし、李王家の当主も王というが、皇族の王と王族の王は全く違うものである。