Beginning of hostilities (931–936) ) Disagreement exists about the exact cause of Masakado's rebellion. While some sources portray the uprising as revenge for his failure to secure a government post, the , an anonymous
monograph on Masakado's life believed to have been completed as early as the 940s, suggests that the conflict originally began in 931 (
Jōhei 1) as a dispute between Masakado, freshly returned from Heian-kyō, and his paternal uncle
Taira no Yoshikane (平良兼) over a woman. (Aristocratic marriages during the Heian period were usually
matrilocal; the wife continued to reside with her parents while the husband either moved in with his wife's family or simply visited her.) Besides this affront to his honor, Masakado not obtaining any post or rank in the capital might have been another factor in Yoshikane's opposition to the marriage. , the sorceress, is shown carrying a sword in one hand, a bell in the other, and a torch in her mouth; the toad, her familiar, is shown in the inset with her father, Taira no Masakado.
Ukiyo-e woodblock print by
Yōshū Chikanobu, 1884. On the 21st day of the 10th month of the same year,
Taira no Yoshimasa (平良正), Masakado's paternal uncle or cousin who was also related by marriage to Mamoru, seeking to avenge the deaths of Kunika and Mamoru's sons, faced Masakado in battle in the village of Kawawa (川曲村) in western Hitachi (identified with the town of
Yachiyo, Ibaraki) After his humiliating defeat, Yoshimasa called to Yoshikane – now the vice-governor of Kazusa Province – for aid, who then gathered a large number of warriors from Kazusa and Shimōsa such that officials from the two provinces initially attempted to prevent their dispatch (Such protests were later withdrawn after the issue was deemed to be a private matter beyond the sphere of state affairs). On the 26th day of the 6th month of 936 (Jōhei 6), Yoshikane led his massive army to Hitachi, where he joined forces with Yoshimasa and Kunika's son
Sadamori (who had been in the capital when his father was killed and initially took a neutral stance), whom he had prevailed upon to take part in the attack against Masakado. They made contact at the border between Hitachi and
Shimotsuke (modern
Tochigi Prefecture) with Masakado, who went there to verify reports about a plan to launch a joint attack on him from the north. Despite only having about a hundred poorly-equipped soldiers with him, Masakado inflicted heavy casualties upon his enemies' several thousand strong army. Scattered and thrown into confusion, Yoshikane and the remnants of his forces fled to the
provincial headquarters of Shimotsuke, Masakado pursuing them. Although he managed to surround his uncle in the governmental offices, Masakado, seemingly concerned about subsequent censure should he kill Yoshikane then and there, allowed him to escape through a gap in his western line. He then filed a formal grievance with the provincial authorities in neighboring provinces before returning to his territory. Not long after his victory, Masakado received a summons from the imperial court because of a complaint lodged against him by Minamoto no Mamoru over the battle at Nomoto. Masakado then hurried to the capital to give an account of himself; his lord, Fujiwara no Tadahira, probably intervened in the case and helped lighten his punishment. He was eventually pardoned early the following year (937 / Jōhei 7) when a general
amnesty was declared at the occasion of
Emperor Suzaku's coming of age (
genpuku).
Masakado and Yoshikane (937–938) Anxious to avenge his defeat, Yoshikane almost immediately recommenced hostilities upon Masakado's return. He first launched an attack on Masakado at the
Kogai River near the border between Shimōsa and Hitachi while displaying portraits of Yoshimochi and Takamochi (Masakado's father and grandfather) in front of his vanguard. This ploy succeeded in weakening the morale of Masakado and his men, who "withdrew, carrying their shields." (
Shōmonki) Afterwards, Yoshikane burned a critical stable and some houses at Masakado's base in
Toyoda District in Shimōsa to weaken his ability to make war. Masakado launched a counterattack some days later, but was again defeated due to being struck by a severe pain in his legs (thought to be due to
beriberi). During his retreat, Masakado had his wife (Yoshikane's daughter) and children flee by boat for their safety, but Yoshikane discovered them and carried them off to Kazusa. The woman's brothers eventually allowed them to escape back to Masakado.
Death In 939 (
Tengyō 2, 12th month), Masakado led a minor rebellion which is also known as
Tengyō no Ran. The armed struggle began when Masakado led an attack on an outpost of the central government in
Hitachi Province, capturing the governor. In December of that year, he conquered
Shimotsuke and
Kōzuke Provinces; and he claimed the title of Shinnō (New
Emperor). The central government in
Kyoto responded by putting a
bounty on his head, and fifty-nine days later his cousin
Taira no Sadamori, whose father Masakado had attacked and killed, and
Fujiwara no Hidesato, killed him at the Battle of Kojima (
Shimōsa Province) in 940 and took his head to the capital. ==Aftermath==