The diameter of the round rear of this kofun nearly matches that of the round barrow of Himiko, 'a hundred odd bu' (a unit of volume), described in the "Gishiwajin-den."
この古墳の後円部の直径が『魏志倭人伝』にある卑弥呼の円墳の直径「百余歩」にほぼ一致すること。