大化改新
Tōchi was the only daughter of Prince Ōama, later Emperor Tenmu, and one of his wives, Princess Nukata, daughter of Prince Kagami and known as a renowned court poet. Prince Ōama was a younger brother of Prince Naka-no-Ōe, who killed his political enemies, Soga no Iruka and Soga no Emishi, with one of his servants, Nakatomi no Kamatari, and set up the Taika Reform in 645. Prince Ōama divorced Nukata to let her be a wife of Naka-no-Ōe, who liked and wished to marry her. As Prince Naka-no-Ōe gained political power, Ōama could not refuse what his brother wanted to do.