Soga clan
The historian and archeologist Sadakichi Kita (1871 - 1939) proposed that the Ishibutai Kofun is the above-mentioned "Momohana" tomb in the "Nihon Shoki". Kita also proposed that the earthen mound of the Ishibutai Kofun was removed after Soga no Umako's death as a punishment of the Soga clan by the imperial government.