Asukabehime - Asukabehime

…She became the wife of Prince Yasuyuku when Prince Suku ascended to the throne, and in 727 (Jinki 4), she gave birth to Prince Motoi (according to the Honcho Koin Shounroku), who was immediately made crown prince, but died young the following year. In the same year, Prince Asaka was born to another wife of Emperor Shomu, Inukai Hirotoji, and the Fujiwara clan feared that their maternal relationship with the imperial family would be cut off. As a means of preventing this, they planned to make Yasuyukuhime empress, noting that it had been customary for an empress to ascend to the throne as a female empress after the death of her husband. To this end, they falsely accused Prince Nagaya, who opposed the idea, and removed him (the Nagaya Incident), had a lucky turtle presented from Furuichi County, Kawachi Province, where Michiyo was born, and the era name was changed to Tenpyo, and in 729 (Tenpyo 1), she finally became empress from outside the imperial family. …

*Some of the terminology that refers to "Yasukuhime" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…首皇子の即位により夫人となり，727年(神亀4)皇子(《本朝皇胤紹運録》は基王)を生み，直ちに皇太子に立てたが翌年夭死した。同じ年聖武天皇のもう1人の夫人県犬養広刀自に安積（あさか）親王が誕生したため，藤原氏は天皇家との外戚関係が絶えることを恐れ，それを防ぐ手段として，それまでは皇后が夫帝の死後女帝として即位するのが慣例であったことに着目し，安宿媛の立后を画策した。そのため反対派の長屋王を誣告によって排除し(長屋王の変)，三千代の出身地河内国古市郡から瑞亀を献上させて天平と改元，729年(天平1)にはついに皇族以外から出て皇后となった。…

※「安宿媛」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報