Empress Kōken
He married Imperial Princess Ikami, a daughter of Emperor Shōmu, producing a daughter and a son. After his sister in law, Empress Shōtoku (also Empress Kōken), died, he was named her heir. The high courtiers claimed the empress had left her will in a letter in which she had appointed him as her successor. Prior to this, he had been considered a gentle man without political ambition.