In April 479, when the Emperor learned the death of Samgeun of Baekje, he let the hostage Mata O (the second son of Konki O) go home with 500 warriors of Chikushi region, and had him succeed to the throne as Dongseong of Baekje.
479年4月、百済の三斤王が亡くなると、入質していた昆支王の次子未多王に筑紫の兵500をつけて帰国させ、東城王として即位させた。