Currently I am researching the historical figure of yul-gok in relation to Korean neo-confucianism. However, I am having a problem verifying a statement that is made in most ITF TKD sources about the nickname of Yul-gok. That is, he is sometimes named "the Confucius of Korea." I can find no textual evidence of this EXCEPT in TKD sources.
Oddly enough, there is another figure who has been given the name "The Confucius of the East[meaning I expect Korea]"- Choi Chung. Toi-Gye is named "Zhu Xi of the East", after the foudner of Chinese neo-confucianism.
Can anyone verify Yul-gok's nickname with anything other than a martial arts source, since it is my hunch that whoever ascribed this nickname to Yul-gok was mistaken and it has subsequently been copied by all martial arts resources.