Additionally, this grandfather of the Emperor Keita was written as 'Shi (or Oi) no Okimi' in historical books and genealogy tables during the Medieval Period; such as: "Mizu Kagami" (Japanese historical book); "Gukansho" ("Jottings of a Fool"; a Japanese historical book written by Jien, a Buddhist priest of the Tendi sect.); the "Jinno Shotoki" ("Chronicles of the Authentic Lineages of the Divine Emperors"; a Japanese historical book written by Chikafusa KITABATAKE); and the "Honcho koin jounroku" (family tree charts of emperors and imperial families in Japan).
なお、『水鏡』・『愚管抄』・『神皇正統記』・『本朝皇胤紹運録』など、中世の史書・系譜類に継体の祖父として記されている、「私斐王」。