Then to complicate matters the Japanese Nihon Shoki calls him the son of the 20th king, Biyu of Baekje.
[3] In 461 he was dispatched as an envoy and hostage to Yamato period Japan together with his wife (or step-mother) from Baekje.
The Nihon Shoki says his son Dongseong of Baekje is the child of a Japanese woman.
In 477 when his brother King Munju left the city from Hansung to Woongjin, Gonji returned to Baekje and took over protection of the crown prince, Samgeun but he died suddenly in July of that year.
According to stories, there were other offspring to Gongji besides Muryeong and Dongseong, and these descendants settled in the village of Habikinoyasuka.