Since the emperor already had four sons with his queen FUJIWARA no Seishi (FUJIWARA no Naritoki's daughter) from the time when he was Togu (Crown Prince) it was without question that Kenshi's destiny was to sire a male heir just like her older sister Shoshi.
天皇には東宮時代からの妃藤原せい子（藤原済時女）との間に既に四男があったから、妍子の使命も姉彰子同様に男御子を産むことであったのは言うまでもない。