There was an accepted theory that Emperor Temmu was a younger brother of Emperor Tenchi (Tenji), but this is denied; another theory is that Emperor Temmu was Aya no Miko, whom Empress Kogyoku had before she married Emperor Jomei, and that he was an older half-brother of Emperor Tenchi (Tenji).
即ち、従来定説とされてきた、天武天皇は天智天皇の弟であるというのは誤りで、皇極天皇が舒明天皇と結婚する前に生んだ漢皇子であり、彼は天智天皇の異父兄であるとする説に基づくものである。