However, in 'History of Paekche' of "Samguk Sagi" (History of the Three Kingdoms), since it says that the relationship with Yamato (ancient Japan) was established in AD 653, it was conjectured that he might have come around this time.
が、『三国史記』百済本紀には義慈王13年（653年）倭国と通好すとあるので、この頃ではないだろうかとする説もある。