In the aftermath of Yoritomo’s death, leading gokenin and administrators formed the Council of Thirteen to manage Kamakura governance—an early mechanism through which the Hōjō faction would dominate decision-making.
Shogun Minamoto no Yoritomo died in 1199, triggering a succession crisis in which the Hōjō (Yoritomo’s in-laws) moved to exercise effective control over the Kamakura government through a regency.
Powerful retainer Kajiwara Kagetoki was killed in 1200 after losing support among Kamakura elites, an episode that reshaped factional balances inside the early shogunate.
Minamoto no Yoriie formally became the 2nd Kamakura shōgun (1202–1203). Political authority, however, increasingly shifted away from the shōgun and toward the Hōjō-led regency apparatus.
Hōjō Tokimasa assumed the office of shikken (shogunal regent), formalizing the Hōjō family’s role as the effective executive authority over the Kamakura shōgun.
After Yoriie’s removal, Minamoto no Sanetomo became shōgun (1203–1219). His tenure marked the consolidation of a political pattern in which the shōgun was increasingly a figurehead under Hōjō regents.
Hiki Yoshikazu was killed (and the Hiki suppressed) amid Kamakura power struggles. The purge weakened rivals to the Hōjō and accelerated the regency’s grip over the shogunate’s center.
Former shōgun Minamoto no Yoriie was assassinated in 1204 after being deposed and confined, removing a focal point for anti-Hōjō resistance within the Minamoto line.
After an alleged plot surrounding Sanetomo, Tokimasa was deposed, and Hōjō Yoshitoki became shikken—making the regency more firmly hereditary within the Hōjō and strengthening governance through Kamakura institutions.
The Wada Rebellion (spring 1213) pitted Wada Yoshimori’s faction against regent Hōjō Yoshitoki in Kamakura. Its suppression helped eliminate a major military rival and reinforced Hōjō dominance.
On 1219-02-13, shōgun Minamoto no Sanetomo was assassinated at Tsurugaoka Hachimangū by his nephew Kugyō, ending the direct Minamoto shogunal line and forcing the Hōjō to select a new shōgun from outside it.
In 1221, retired emperor Go-Toba attempted to overthrow the Kamakura regime in the Jōkyū Disturbance/War. The Hōjō-led victory further subordinated the imperial court to Kamakura’s military government.
After the Jōkyū War, the Kamakura leadership established the Rokuhara Tandai in/near Kyoto to monitor and control imperial-court politics, extending Hōjō administrative reach into the capital region.
During the Iga Incident (June 1224), a faction sought to redirect the regency succession. Hōjō Masako backed Hōjō Yasutoki (Yoshitoki’s heir), ensuring continuity of the main Hōjō regency line.
Regent Hōjō Yoshitoki died on 1224-07-01, opening a struggle over succession within the Hōjō political coalition and setting the stage for Masako’s decisive intervention.
In 1225, regent Hōjō Yasutoki created the shogunate’s Hyōjō council system, a foundational institutional step in the mature Hōjō regency’s governance and adjudication practices.
Hōjō Masako died on 1225-08-16 after years of guiding Kamakura politics as the powerful “nun shogun” (ama-shōgun) figure, including key interventions that stabilized and entrenched the Hōjō regency system.
Hōjō Tokimasa and Hōjō Masako: Founding the Hōjō Regency (1199–1225)
