Lady Hangaku (坂額御前, Hangaku Gozen) was a onna-musha warrior, one of the relatively few Japanese warrior women commonly known in history or classical literature. She took a prominent role in the Kennin Rebellion, an uprising against the Kamakura shogunate in 1201.
Hangaku Gozen was a member of the Taira clan who lived with her family in Echigo. Also known as Hangaku Itazaki, she was the daughter of Jo Sukenaga, who was defeated by Kiso Yoshinaka in battle. She joined her uncle, Jo Nagamochi, and cousin, Jo Sukemori, in the Kennin Rebellion of 1201, and became an integral part of their defensive operations at Torisaka Castle.
Hangaku was noted for her leadership and bravery during the three-month long defense during which she and Sukemori led forces of men against Sasaki Moritsuna's bakufu army, who were loyal to the Kamakura Shogunate. "Dressed as a boy", Hangaku stood on the tower of the castle and all those that came to attack her were shot down by her arrows which pierced them either in their chests or their heads.
The rebel defenses were eventually struck down and Hangaku's fighting stopped only after she was wounded by an arrow that pierced her thigh. She was captured and presented, "fearless as a man and beautiful as a flower", as a prisoner of war to the Shogun Minamoto Yoriiye, who was intrigued by her beauty and reputation. Lady Hangaku was precluded from ritual suicide by the Shogun's orders to marry his retainer, Asari Yoshito. Later, she reportedly delivered a son, but there is little record of the remainder of her life.