Imperial Court in Kyoto in the context of "Kyoto Prefecture"

Heian-kyō (平安京; lit. "peaceful/tranquil capital") was one of several former names for the city now known as Kyoto. It was the de jure capital of Japan for over one thousand years, from 794 to 1868 with an interruption in 1180.

Emperor Kanmu established it as the capital in 794, moving the Imperial Court there from nearby Nagaoka-kyō at the recommendation of his advisor Wake no Kiyomaro and marking the beginning of the Heian period of Japanese history. According to modern scholarship, the city is thought to have been modelled after the urban planning for the Tang dynasty Chinese capital of Chang'an (modern-day Xi'an). It remained the chief political center until 1185, when the samurai Minamoto clan defeated the Taira clan in the Genpei War, moving administration of national affairs to Kamakura and establishing the Kamakura shogunate.

The Boshin War (戊辰戦争, Boshin Sensō), sometimes known as the Japanese Revolution or Japanese Civil War, was a civil war in Japan fought from 1868 to 1869 between forces of the ruling Tokugawa shogunate and a coalition seeking to seize political power in the name of the Imperial Court.

The war stemmed from dissatisfaction among many nobles and young samurai with the shogunate's handling of foreigners following the opening of Japan during the prior decade. Increasing Western influence in the economy led to a decline similar to that of other Asian countries at the time. An alliance of western samurai, particularly the domains of Chōshū, Satsuma, and Tosa, and court officials secured control of the Imperial Court and influenced the young Emperor Meiji. Tokugawa Yoshinobu, the sitting shōgun, realizing the futility of his situation, abdicated and handed over political power to the emperor. Yoshinobu had hoped that by doing this the House of Tokugawa could be preserved and participate in the future government.

The Kamakura shogunate (Japanese: 鎌倉幕府, Hepburn: Kamakura bakufu) was the feudal military government of Japan during the Kamakura period from 1185 to 1333.

The Kamakura shogunate was established by Minamoto no Yoritomo after victory in the Genpei War and appointing himself as shōgun. Yoritomo governed Japan as military dictator from the eastern city of Kamakura with the emperor of Japan and his Imperial Court in the official capital city of Heian-kyō (Kyoto) as figureheads. The Kamakura shōguns were members of the Minamoto clan until 1226, the Fujiwara clan until 1252, and the last six were minor princes of the imperial family. The Hōjō clan were the de facto rulers of Japan as shikken (regent) of the shōgun from 1203. The Kamakura shogunate saw the Jōkyū War in 1221 and the Mongol invasions of Japan under Kublai Khan in 1274 and 1281. The Kamakura shogunate was overthrown in the Kenmu Restoration under Emperor Go-Daigo in 1333, re-establishing Imperial rule until Ashikaga Takauji and his offspring overthrew the imperial government and founded the Ashikaga shogunate in 1336 (Nanboku-chō period).

The Hōjō clan (Japanese: 北条氏, Hepburn: Hōjō-shi) was a Japanese samurai family who controlled the hereditary title of shikken (regent) of the Kamakura shogunate between 1203 and 1333. Despite the title, in practice the family wielded actual political power in Japan during this period compared to both the Kamakura shoguns, or the Imperial Court in Kyoto, whose authority was largely symbolic. The Hōjō are known for fostering Zen Buddhism and for leading the successful opposition to the Mongol invasions of Japan. Resentment at Hōjō rule eventually culminated in the overthrow of the clan and the establishment of the Ashikaga shogunate.

The kuge (公家; Japanese pronunciation: [kɯ.ɡe, -ŋe]) was a Japanese aristocratic class that dominated the Japanese Imperial Court in Kyoto. The kuge were important from the establishment of Kyoto as the capital during the Heian period in the late 8th century until the rise of the Kamakura shogunate in the 12th century, at which point it was eclipsed by the bushi. The kuge still provided a weak court around the Emperor until the Meiji Restoration, when they merged with the daimyō, regaining some of their status in the process, and formed the kazoku (peerage), which lasted until the Japanese peerage system was abolished with the 1947 constitution. Though there is no longer an official status, members of the kuge families remain influential in Japanese society, government, and industry.

The Kenmu Restoration (Japanese: 建武の新政, Hepburn: Kenmu no shinsei) was a three-year period of Imperial rule in Japanese history between the Kamakura period and the Muromachi period from 1333 to 1336. The Kenmu Restoration was an effort made by Emperor Go-Daigo to overthrow the ruling Kamakura Shogunate (de facto ruled by Hōjō clan) and restore the Imperial House to power in Japan, returning to civilian government after 148 years of de facto military government from Kamakura. Go-Daigo launched the Genkō War in 1331 against the Kamakura Shogunate but was defeated and forced to exile to the Oki Islands. Go-Daigo launched a second uprising, and with the assistance of the defected Kamakura general Ashikaga Takauji and rebel leader Nitta Yoshisada, defeated the Kamakura Shogunate at the siege of Kamakura in 1333. The Imperial House was restored to power but Go-Daigo's policies failed to satisfy his major samurai supporters and most Japanese people. The Kenmu Restoration was ultimately overthrown when Takauji became Shōgun and founded the Ashikaga Shogunate in 1336, beginning the "Northern and Southern Courts" period and the Muromachi period.

The Kenmu Restoration was the last time the Emperor of Japan held significant power until the Meiji Restoration in 1868.

Tokugawa Iemitsu (徳川 家光; 12 August 1604 – 8 June 1651) was the third shōgun of the Tokugawa dynasty. He was the eldest son of Tokugawa Hidetada with Oeyo, and the grandson of Tokugawa Ieyasu. Lady Kasuga was his wet nurse, who acted as his political adviser and was at the forefront of shogunate negotiations with the Imperial court. Iemitsu ruled from 1623 to 1651; during this period he crucified Christians, expelled all Europeans from Japan and closed the borders of the country, a foreign policy that continued for over 200 years after its institution.

The Northern Fujiwara (奥州藤原氏 Ōshū Fujiwara-shi) were a Japanese noble family that ruled the Tōhoku region (the northeast of Honshū) of Japan during the 12th century, 1094-1104, as their own realm.

They succeeded the semi-independent Emishi families of the 11th century, who were gradually brought down by the Minamoto clan loyal to the Imperial Court in Kyoto. They ruled over an independent region that derived its wealth from gold mining, horse-trading and as middlemen in the trade in luxury items from continental Asian states and from the far northern Emishi and Ainu people. They were able to keep their independence vis-a-vis Kyoto by the strength of their warrior bands until they were ultimately conquered by the Kantō samurai clans led by Minamoto no Yoritomo, in the Battle of Ōshū in 1189.