Conventional research on Kamakura-Fu (鎌倉府), which ruled the ten eastern provinces of the Kanto region during the Muromachi period, has tended to concentrate more on its relationship with the Muromachi Bakufu in Kyoto and less on what kind of power structure supported it and how this government controlled the various classes in the Kanto area. The present paper starts out to consider Kamakura-Fu's power structure and its control over the Kanto Plain, especially the power base of the Kamakura Kubo (鎌倉公方). Then, the author switches attention to the Hoko-shu (奉公衆) itself, which formed the military and political base of the Kamakura Kubo's ruling power ; and together with identifying that group of attendants from existing documents, he summarizes the Hoko-shu's conditions of existence and its organizational process. Concerning the Hoko-shu's conditions of existence, from the historical source entitled Kamakura Nenchu Gyoji (鎌倉年中行事), describing yearly events and ceremonies in that administrative town, we find three statuses within the Hoko-shu, namely 1)the Hyojo-shu (評定衆), 2)the Hikitsuke-shu (引付衆) and 3)other members. We see clear status discrimination toward those "other members" excluded from (or positioned below) statuses 1) and 2). Also, as the Hoko-shu formed a rotation system for guarding the Kubo's palace (gosho 御所), there were also members located (or living) in the provinces. The author was able to identify from the available sources 74 members of the Kamakura-Fu Hoko-shu. Their names and conditions of membership may be summarized as follows : A)The Ashikaga clan families including the Kira (吉良), Shibukawa (渋川), Isshiki (一色), Imagawa (今川), Kako (加子) and Hatakeyama (畠山). B)The original Ashikaga family vassals including the Uesugi (上杉), Ko (高), Kido (木戸), Noda (野田), Teraoka (寺岡), Kajiwara (梶原), Ebina (海老名), Shidara (設楽) and Yanada (簗田). C)Traditional Kamakura based bureaucrats including the Nikaido (二階堂), Nagai (長井), and Machino (町野). All of the families included in A, B and C served the Kamakura Kubo from the inception of Kamakura-Fu ; and during the era of Kubo Motouji (1349-67), the B group of Ashikaga vassals formed the dominant power group of the Hoko-shu. However, beginning from the era of Kubo Ujimitsu (1367-98) the Kamakura Kubo more and more included in the Hoko-shu many provincial bigmen (kokujin 国人) throughout the Kanto Plain. And so, when Mitsukane became Kubo (1398-1409), the number of Hoko-shu members had greatly increased, and their main source of power had shifted to a new group (D) made up of these same Kanto Plain kokujin. These included the likes of the Ohmori (大森) of Suruga, the Honma (本間) and Miura (三浦) of Sagami, the Edo (江戸) of Musashi, the Satomi (里見), Yamana (山名), Nawa (那波) and Takayama (高山) of Kozuke, the Sano (佐野) of Shimotsuke, the Shishido (宍戸), Tsukuba (筑波) and Oda (小田) of Hitachi and the Unagami (海上), Indo (印東) and Ryugasaki (龍崎) of Shimousa. During Mitsukane's reign such families as the Shishido and Unagami even appear in the elite corps of Kubo palace functionaries (gosho bugyo 御所奉行). As a result of their personal hold over these Kanto Plain kokujin, the Kamakura Kubos were able to expand quite successfully their own direct military bases.

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