Kiyohara no Iehira (清原家衡) (died 1087) was a member of the Kiyohara clan, which wielded significant power in the Tōhoku region from around 1063 to 1089, during Japan's Heian period; he was also a key participant in the Gosannen War which grew out of conflicts within the clan.
Minamoto no Yoshiie traveled to the region in hopes of settling the conflict and restoring peace and order.
The Minamoto suffered heavy losses besieging this stockade, due primarily to the cold and snow, and had to withdraw.
Yoshiie, allied with his brother Yoshimitsu and Fujiwara Kiyohira, laid siege to the Kiyowara position from August to November 1087.
[1] According to the Kokon Chomonjū, Yoshiie saw a flock of birds emerge from the forest when he was on his way to attack the Kiyohara camp; this told him that an ambush had been set up, since the Kiyohara ambushers disturbed the birds, and thus Yoshiie was able to avoid the attack.