Japanese clans in the context of "Matsunaga clan"

Minamoto (源; Japanese pronunciation: [mʲi.na.mo.to]) was a noble surname bestowed by the Emperors of Japan upon members of the imperial family who were excluded from the line of succession and demoted into the ranks of the nobility since 814. Several noble lines were bestowed the surname, the most notable of which was the Seiwa Genji, whose descendants established the Kamakura and Ashikaga shogunates following the Heian era. The Minamoto was one of the four great clans that dominated Japanese politics during the Heian period in Japanese history—the other three were the Fujiwara, the Taira, and the Tachibana.

In the late Heian period, Minamoto rivalry with the Taira culminated in the Genpei War (1180–1185 AD). The Minamoto emerged victorious and established Japan's first shogunate in Kamakura under Minamoto no Yoritomo, who appointed himself as shōgun in 1192, ushering in the Kamakura period (1192–1333 AD) of Japanese history. The name "Genpei" comes from alternate readings of the kanji "Minamoto" (源 Gen) and "Taira" (平 Hei).

The Taira (平; Japanese pronunciation: [taꜜi.ɾa]) was one of the four most important clans that dominated Japanese politics during the Heian period of Japanese history – the others being the Minamoto, the Fujiwara, and the Tachibana. The clan is divided into four major groups, named after the emperors they descended from: Kanmu Heishi, Ninmyō Heishi, Montoku Heishi, and Kōkō Heishi, the most influential of which was the Kanmu Heishi line.

In the twilight of the Heian period, the Taira controlled the boy emperor Antoku (himself the grandson of the powerful Kugyō Taira no Kiyomori) and had effectively dominated the Imperial capital of Heian. However, they were opposed by their rivals the Minamoto clan (the Genji), which culminated in the Genpei War (1180–1185 AD). The five-year-long war concluded with a decisive Taira defeat in the naval Battle of Dan-no-Ura, which resulted in the deaths of Antoku and Taira leaders. Following the war, the victorious Minamoto established Japan's first shogunate in Kamakura. The name "Genpei" comes from alternate readings of the kanji "Minamoto" (源 Gen) and "Taira" (平 Hei).

Kami (Japanese: 神; [kaꜜmi]) are the deities, divinities, spirits, mythological, spiritual, or natural phenomena that are venerated in the traditional Shinto religion of Japan. Kami can be elements of the landscape, forces of nature, beings and the qualities that these beings express, and/or the spirits of venerated dead people. Many kami are considered the ancient ancestors of entire clans (some ancestors became kami upon their death if they were able to embody the values and virtues of kami in life). Traditionally, great leaders like the Emperor could be or became kami.

In Shinto, kami are not separate from nature, but are of nature, possessing positive and negative, and good and evil characteristics. They are manifestations of musubi (結び), the interconnecting energy of the universe, and are considered exemplary of what humanity should strive towards. Kami are believed to be "hidden" from this world, and inhabit a complementary existence that mirrors our own: shinkai (神界; "the world of the kami"). To be in harmony with the awe-inspiring aspects of nature is to be conscious of kannagara no michi (随神の道 or 惟神の道; "the way of the kami").

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.

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.

Imagawa clan (Japanese: 今川氏, Hepburn: Imagawa-uji) was a Japanese samurai clan that claimed descent from the Seiwa Genji by way of the Kawachi Genji.