It is therefore assumed that, in order to strengthen the political position of the Imperial Princes of the Empress, Imperial Princess Koshi, who was the maternal sister of Heizei and Saga, was made to marry Imperial Prince Otomo, who had a mother from the same the Ceremonial House of the Fujiwara clan.
「后腹」の親王の政治的立場を強化するために平城・嵯峨の同母妹である高志内親王を同じ式家出身の母親を持つ大伴親王に嫁がせたと考えられている。