The rise of the Kamakura Shogunate marks a pivotal moment in Japanese history, transitioning from the aristocratic Heian period to the feudal system dominated by the samurai. This era began with the victory of Minamoto no Yoritomo, who, after the Genpei War (1180-1185), established a new form of governance centered in Kamakura, a small coastal town far from the imperial capital of Kyoto.

The Genpei War was a civil conflict between the Taira and Minamoto clans, which ultimately ended with the defeat of the Taira in the Battle of Dan-no-ura in 1185. Minamoto no Yoritomo, the leader of the Minamoto clan, emerged as the victor, but his triumph was not simply a personal or clan-based success. Yoritomo's victory laid the foundation for a shift in the political landscape of Japan. The Taira had represented the old courtly aristocracy that governed Japan through the imperial system, but the rise of the Minamoto signaled the beginning of samurai dominance and a move toward military rule.

In 1192, Yoritomo was granted the title of shogun by the emperor, an act that formalized his military authority. This title, meaning "generalissimo" or "commander of the army," was traditionally given to military leaders in times of war but had never been used as the primary governing title before. This marked the official beginning of the Kamakura Shogunate, a military dictatorship that would rule Japan for over a century. Though the emperor remained the nominal ruler, Yoritomo's power was based in Kamakura, far from the imperial court, which shifted the balance of power from the capital to the military elite.