The Hatakeyama Shigetada Incident

Background — Hatakeyama Shigetada, "The Model of a Kamakura Warrior"

Hatakeyama Shigetada was born in 1164 (Choukan 2) in Hatakeyama, Obusuma District, Musashi Province (present-day Fukaya City, Saitama Prefecture). He distinguished himself in numerous engagements of the Genpei War, including the Battle of the Uji River and the Battle of Ichi-no-Tani, and also campaigned in the Oshu Campaign, establishing himself as one of Minamoto no Yoritomo's most trusted vassals since the earliest days of his uprising. Within Musashi Province, Shigetada held the important office of rusudokoro-sokengyo-shiki, overseeing the province's warrior bands, and his reputation for integrity earned him the later epithet "the model of a Kamakura warrior." His residence stood at Sugaya, in Hiki District, Musashi Province (present-day Ranzan, Saitama Prefecture); the ruins of this Sugaya-yakata are preserved today as a National Historic Site.

After Yoritomo's death, Hojo Tokimasa, who had come to control the shogunate, appointed Taira no Asamasa — the son-in-law of his second wife, Maki no Kata — as governor of Musashi Province, seeking to extend his influence over the province's governance. To the Hatakeyama clan, which had long held sway in Musashi, this appeared as a direct threat to its own standing, and tensions between the two sides gradually mounted.

The Feud Between Taira no Asamasa and Hatakeyama Shigeyasu

On the 4th day of the eleventh month of 1204 (Genkyu 1), a banquet was held at Asamasa's residence in Kyoto to honor the gokenin who had traveled there to escort the bride of Shogun Minamoto no Sanetomo. At this gathering, a heated quarrel broke out between Asamasa and Shigetada's eldest son, Hatakeyama Shigeyasu. The following day, Tokimasa's own son, Hojo Masanori, died of illness in Kyoto, and an air of unease began to settle over Tokimasa's circle.

Maki no Kata's Accusation and Tokimasa's Decision

On the 21st day of the sixth month of 1205 (Genkyu 2), Asamasa complained to his mother-in-law Maki no Kata that he had been insulted by Shigeyasu. Maki no Kata, acting on her son-in-law's complaint, reported to Tokimasa that Shigetada and his son harbored treasonous intent. Believing this accusation, Tokimasa resolved to move against the Hatakeyama, father and son.

The Battle of Futamatagawa — The Deaths of Shigeyasu and Shigetada

Early on the morning of the 22nd of the sixth month, Hatakeyama Shigeyasu was ambushed and killed at Yuigahama in Kamakura by forces under Miura Yoshimura and others. That same afternoon, Shigetada, summoned to Kamakura and unaware of what had unfolded, arrived at Futamatagawa in Musashi Province (present-day Asahi Ward, Yokohama City, Kanagawa Prefecture), where he encountered a force of several thousand under the command of Hojo Yoshitoki. Shigetada had brought with him a mere 134 horsemen; hopelessly outnumbered, he was struck down by arrows and killed at the age of forty-two. His son Shigehide and his other followers took their own lives alongside him.

The Maki Clan Incident — Tokimasa's Downfall

The day after the battle, on the 23rd of the sixth month, the commanding Hojo Yoshitoki told his father Tokimasa that Shigetada had, in fact, harbored no treasonous intent, revealing the affair as the destruction of an innocent and powerful vassal on false grounds. Then, on the 19th day of the intercalary seventh month, it came to light that Tokimasa and Maki no Kata had been plotting to install their son-in-law Asamasa as shogun in place of Sanetomo; Hojo Masako and Yoshitoki moved to block the scheme, in what became known as the Maki Clan Incident. Tokimasa was forced to take Buddhist vows and was banished to Izu Province, ending his role at the center of shogunate politics. On the 26th of the seventh month, Asamasa too was put to death in Kyoto. In the wake of this affair, Hojo Yoshitoki assumed effective control of the shogunate's government as its second regent (shikken).

Later Influence and the Sugaya-yakata

Following the Hatakeyama Shigetada Incident, the power of Musashi Province's leading warrior families was sharply diminished, cementing Hojo control over the province. Shigetada's former residence at Sugaya-yakata was later used as a stronghold by the Yamanouchi Uesugi clan and, still later, by the Go-Hojo clan, and its remains today stand as a testament to the history of medieval fortified residences in the Kanto region, spanning from the Kamakura period to the Sengoku period. The tragedy of Shigetada, destroyed on false charges despite his loyalty, has long been remembered in later generations as the fate of "the model of a Kamakura warrior."