Emperor Kōkaku
Yoshiko's father, Emperor Go-Momozono, died without a son when she was ten months old. To avoid dynastic interregnum, Retired Empress Go-Sakuramachi and her chief adviser encouraged the dying emperor to adopt Prince Morohito, whose biological father was Prince Sukehito, the second Prince Kan'in. Morohito, who would be known as Emperor Kōkaku later, acceded to the throne at age eight.