続日本紀
On 23 December 2001, during his annual birthday meeting with reporters, the Emperor, in response to a reporter's question about tensions with South Korea, remarked that he felt a kinship with Koreans and went on to explain that, in the "Shoku Nihongi", the mother of Emperor Kammu (736–806) is related to Muryeong of Korea, King of Baekje, a fact that was considered taboo for discussion.