Minamoto clan
The Minamoto clan (源氏, Genji), a major noble family in medieval Japan, originated from imperial descendants granted the surname Minamoto during the 9th-century practice of dynastic shedding to limit princely succession claims, with the name signifying "source" or "fount."[1] The clan's most prominent branch, the Seiwa Genji, descended from Emperor Seiwa (r. 858–876 CE) through his son Prince Yasuyori, providing a prestigious lineage that later shogunal houses invoked for legitimacy.[1] Initially serving as provincial officials and warriors for the imperial court and noble estates during the Heian period (794–1185 CE), the Minamoto developed martial expertise amid privatized military roles, positioning them as key players in regional power struggles.[2] Their rivalry with the Taira clan intensified after events like the 1159 Heiji Incident, where Minamoto forces suffered defeat, leading to exiles including future leader Minamoto no Yoritomo.[2] The clan's defining achievement came in the Genpei War (1180–1185 CE), a decisive conflict against the Taira, marked by victories such as the Battle of Kurikara (1183 CE) under Minamoto no Yoshinaka and the naval Battle of Dannoura (1185 CE), which annihilated Taira leadership.[1][3] This triumph enabled Yoritomo to consolidate authority, establishing the Kamakura shogunate in 1192 CE as Japan's first warrior government, shifting power from the Kyoto court to a dual system where the bakufu managed military affairs while the emperor retained symbolic oversight.[3][2] Despite internal divisions, including Yoritomo's elimination of rivals like his brother Yoshitsune, the Minamoto's legacy endures as the foundation of feudal samurai rule, with subsequent shogunates claiming Seiwa Genji descent.[1]