According to 'Kojiki' (The Records of Ancient Matters) and 'Nihon Shoki,' (Chronicles of Japan) wives and concubines of Okimi (Yamato sovereignty) were called 'Kisaki' out of which the one with the highest rank was distinguished from the rest of the wives and concubines that were simply called 'Kisaki', and was called 'Ohkisaki.'
古事記、日本書紀に従えば、古くは大王(ヤマト王権)の妻妾を「キサキ」（后）と称し、そのうちで最高位にあるものを「オホキサキ」と呼び、単なる「キサキ」である他の妻妾と区別した。