Yoshihime (義姫, 1548 – August 13, 1623) was a Japanese noble lady and aristocrat from the Sengoku period.

[1] Yoshihime became known as the Demon Princess of the Ouu (奥 羽 の 鬼 姫) due to her personality and her attempts to usurp the power of the Date clan.

She hated her firstborn, Masamune, because of his one-eyed condition, and favored his younger brother Kojirou to succeed clan leadership.

In 1578, Date Terumune teamed with other clans at Kaminoyama Castle to attack Mogami Yoshiaki.

Yoshihime after learning that her husband had entered battle against her brother, she went on a palaquim to the battlefield, holding a spear, she stood in front of the two armies and forced them to make a peace treaty.

During this time, Yoshiaki continued to seize territories near the Date clan, Yoshihime was aware of her brother's ambition to conquer Tohoku, it is said that she actively assisted him in the plan to kill the leader of the Kaminoyama clan.

Mogami Yoshiaki and Masamune strengthened vigilance to initiate a new invasion, conflicts between Date-Mogami was more serious.

This time she did this to save her son from her brother, and just as in 1578 her plan worked and the Date army retreated without damage.

It is reported that the confrontation between the mother and the child reached the peak by this matter, and Masamune killed his younger brother Date Kojiro himself.

Even after the murder of Kojiro, Yoshihime remained in the Date family and continued to communicate with her son.

In the Siege of Hasedō, Yoshiaki fights alongside Date clan to repel Uesugi from Yamagata.