sentences:  She had a younger brother named Prince Ōtsu, who was born three years later in Na no Ōtsu of Kyūshū.Her mother, Princess Ōta, died when Princess Ōku was seven years old.On the 9th Day of the 10th Month of the "Tenmu's era 3" (674), when she was twelve, she was appointed the "Saiō" by her father, Emperor Tenmu, and sent to the Saikū near Ise Shrine and spent thirteen years there as the Saiō to serve the Goddess Amaterasu that dwelt in the shrine.