Jin'ni-Ō

Jin'ni-Ō (辰爾王, ? – ?) was a prince of Baekje, one of the Three Kingdoms of Korea. He was son of the 29th king, Beop of Baekje and brother of the 30th king, Mu of Baekje. He settled in Japan and became ancestor of the Ōuchi clan and Toyota clan.

He does not appear in the Samguk Sagi or Samguk Yusa but in Japanese and Chinese records. In China he is recorded in the Book of Zhou, Fengsu tong, Wan Xing Tong Pu (萬姓統譜, Genealogies of Ten Thousand Surnames), and Xing pu. In Japan he is recorded in the Shinsen Shōjiroku.

His presence became known through a genealogy sent by Ōuchi Yoshihiro in July, 1398 to Joseon to confirm and prove his claim that he was a descendant of Prince Imseong. In the Shinsen Shōjiroku he is recorded as the 15th generation ancestor of the Ōuchi and Toyota clans.