The description, 'the emperor and the imperial prince of Japan has past away' from "History of Baekje" (one of three books of Paekche [Original Records of Paekche, Records of Paekche, and The New Selection of Paeche], a lost document which is different from "History of Baekje"of Samguk Sagi [History of the Three Kingdoms]) was cited in "Nihonshoki" (Chronicles of Japan) in 531.
『日本書紀』に『百済本紀』（百済三書の一つ、三国史記の『百済本紀』とは異なる逸失書）から531年に「日本天皇及太子皇子、倶崩薨。」という記述が引用されている。