Hosokawa clan in the context of "Higo Domain"

Shogun (将軍, shōgun; English: /ˈʃoʊ.ɡʌn/ SHOH-gun, Japanese: [ɕoː.ɡɯɴ, -ŋɯɴ] ), officially seii taishōgun (征夷大将軍; Japanese: [seꜜi.i | tai.ɕo(ꜜ)ː.ɡɯɴ, seꜜː-, -ŋɯɴ] lit. 'Commander-in-Chief of the Expeditionary Force Against the Barbarians'), was the title of the military rulers of Japan during most of the period spanning from 1185 to 1868. Nominally appointed by the Emperor, shoguns were usually the de facto rulers of the country, except during parts of the Kamakura period and Sengoku period when the shoguns themselves were figureheads, with real power in the hands of the shikken (執権) of the Hōjō clan and kanrei (管領) of the Hosokawa clan. In addition, Taira no Kiyomori and Toyotomi Hideyoshi were leaders of the warrior class who did not hold the position of shogun, the highest office of the warrior class, yet gained the positions of daijō-daijin (太政大臣, Chancellor of the Realm) and kampaku (関白, Imperial Regent), the highest offices of the aristocratic class. As such, they ran their governments as its de facto rulers.

The office of shogun was in practice hereditary, although over the course of the history of Japan several different clans held the position. The title was originally held by military commanders during the Heian period in the eighth and ninth centuries. When Minamoto no Yoritomo gained political ascendency over Japan in 1185, the title was revived to regularize his position, making him the first shogun in the usually understood sense.

Daimyo (大名, daimyō; English: /ˈdaɪm.joʊ/, Japanese: [dai.mʲoꜜː] ) were powerful Japanese magnates, feudal lords who, from the 10th century to the early Meiji period in the middle 19th century, ruled most of Japan from their vast hereditary land holdings. They were subordinate to the shogun and nominally to the emperor and the kuge (an aristocratic class). In the term, dai (大) means 'large', and myō stands for myōden (名田), meaning 'private land'.

From the shugo of the Muromachi period through the Sengoku period to the daimyo of the Edo period, the rank had a long and varied history. The backgrounds of daimyo also varied considerably; while some daimyo clans, notably the Mōri, Shimazu and Hosokawa, were cadet branches of the Imperial family or were descended from the kuge, other daimyo were promoted from the ranks of the samurai, notably during the Edo period.

The Seiwa Genji (清和源氏; Japanese pronunciation: [sei.wa ɡeꜜɲ.dʑi, seː-]) is a line of the Japanese Minamoto clan that is descended from Emperor Seiwa, which is the most successful and powerful line of the clan. Many of the most famous Minamoto members, including Minamoto no Yoshitsune, Minamoto no Yoritomo, the founder of the Kamakura shogunate; and Ashikaga Takauji, the founder of the Ashikaga shogunate, belonged to this line. Tokugawa Ieyasu (1543–1616), founder of the Tokugawa shogunate, also claimed descent from this lineage. The family is named after Emperor Seiwa, whose four sons and twelve grandsons founded the Seiwa Genji. Emperor Seiwa was father of Imperial Prince Sadazumi (貞純親王 Sadazumi Shinnō) (873–916), who was in turn the father of Minamoto no Tsunemoto (源経基) (894–961), one of the founders of the Seiwa Genji, from whom most Seiwa Genji members are descended. Many samurai families belong to this line and used "Minamoto" clan name in official records, such as the Ashikaga, Hatakeyama, Hosokawa, Imagawa, Mori, Nanbu, Nitta, Ogasawara, Ōta, Satake, Satomi, Shiba, Takeda, Toki and the Tsuchiya, among others. The Shimazu and Tokugawa clans also claimed to belong to this line.

A group of Shinto shrines connected closely with the clan is known as the Three Genji Shrines (源氏三神社 Genji San Jinja).

The Ashikaga clan (Japanese: 足利氏, Hepburn: Ashikaga-shi; Japanese pronunciation: [a.ɕi̥.kaꜜ.ɡa(.ɕi), -kaꜜ.ŋa(.ɕi)]) was a Japanese samurai clan and dynasty which established the Ashikaga shogunate and ruled Japan from roughly 1333 to 1573. The Ashikaga were descended from a branch of the Minamoto clan, deriving originally from the town of Ashikaga in Shimotsuke Province (modern-day Tochigi Prefecture).

For about a century, the clan was divided in two rival branches, the Kantō Ashikaga, who ruled from Kamakura, and the Kyōto Ashikaga, rulers of Japan. The rivalry ended with the defeat of the first in 1439. The clan had many notable branch clans, including the Hosokawa, Imagawa, Hatakeyama (after 1205), Kira, Shiba, and Hachisuka clans. After the head family of the Minamoto clan died out during the early Kamakura period, the Ashikaga came to style themselves as the head of the Minamoto, co-opting the prestige which came with that name.

Morihiro Hosokawa (細川 護煕, Hosokawa Morihiro; born 14 January 1938) is a Japanese politician who served as prime minister of Japan from 1993 to 1994. He led an eight-party coalition government which was the first Japanese government not headed by a Liberal Democratic Party (LDP) premier since 1955.

Born to the Hosokawa family, which ruled present-day Kumamoto Prefecture from the 17th to the 19th centuries, Hosokawa is also a grandson of Prince Fumimaro Konoe through his mother. He graduated from Sophia University before working at the Asahi Shimbun newspaper, and was elected to the National Diet in 1971 before leaving to serve as governor of his home prefecture from 1983 to 1991.