The Oda clan (Japanese: 織田氏, Hepburn: Oda-shi) is a Japanese samurai family who were daimyo and an important political force in the unification of Japan in the mid-16th century. Though they reached the peak of their power under Oda Nobunaga and fell soon after, several branches of the family continued as daimyo houses until the Meiji Restoration. After the Meiji Restoration, all four heads of the houses of the clan were appointed viscounts in the new system of hereditary peerage.
According to modern theories, there is no evidence that the Oda clan was descended from the Taira clan, and there is a theory that they were actually descended from the Inbe clan, who were Shinto priests in Otanosho. Fujiwara no Nobumasa, an ancestor of Nobunaga, is believed to have been adopted from the Inbe clan by the Fujiwara.[4] One theory as to why Nobunaga came to claim descent from the Taira clan is that he justified his own seizure of power by exploiting the belief at the time that the Minamoto and Taira clans were destined to alternate in power (源平交替思想, Genpei kōtai shisō). In other words, the idea was that the Minamoto clan, the shogun of the Kamakura shogunate, the Hōjō clan, descended from the Taira clan (Shikken of the Kamakura shogunate), the Ashikaga clan, descended from the Minamoto clan (shogun of the Ashikaga shogunate), and the Oda clan, descended from the Taira clan, were destined to seize power in that order.[1][2][3]
However, there are theories that question whether the people of that time really believed in this idea,[3] and whether the Hojo clan was really descended from the Taira clan.[5][6][7]
After the Onin War, the Shiba clan split into two factions and began warring, and from around 1466, the Oda clan also split into two factions and began warring, with Iwakura Castle and Kiyosu Castle as their respective strongholds.[1]
After the Onin War, the power of the Shiba clan declined, and in 1513, Oda Tatsusada rebelled against the Shiba clan, but the rebellion failed and he was killed. then, Oda Nobutomo increased his power and made the Shiba clan his puppets. During the Tenbun period, Oda Nobuhide overtook the main family and increased his power. In 1538, Nobuhide captured Nagoya Castle and became the most powerful sengoku daimyo in Owari Province.[8][9]
Nobunaga's reign
Oda Nobuhide took Nagoya Castle in 1538 (it was given to Nobunaga in 1542), and built Furuwatari Castle. Oda Nobutomo held Kiyosu Castle, but he was besieged and killed in 1555 by his nephew Oda Nobunaga who operated from Nagoya Castle. This led to the family being divided into several branches, until the branch led by Oda Nobunaga eclipsed the others and unified its control over Owari.
Then turning to neighboring rivals, it, one by one achieved dominance over the Imagawa, Saitō, Azai, Asakura, Takeda and other clans, until Nobunaga held control over central Japan. However, Nobunaga's plans for national domination were thwarted when he fell victim to the treachery of his vassal Akechi Mitsuhide who forced Nobunaga into suicide during the Incident at Honnō-ji in the summer of 1582. The Oda remained titular overlords of central Japan for a short time, before being surpassed by the family of one of Nobunaga's chief generals, Hashiba Hideyoshi.
Edo period
Though the Oda were effectively eclipsed by Toyotomi Hideyoshi following Nobunaga's death, it is not often known that the Oda continued to be a presence in Japanese politics. One branch of the family became hatamoto retainers to the Tokugawa shōgun, while other branches became minor daimyō lords. As of the end of the Edo period, these included Tendō Domain (also known as Takahata Domain, Dewa Province, 20,000 koku), Yanagimoto han (Yamato Province, 10,000 koku), Kaiju han (also known as Shibamura han; Yamato Province, 10,000 koku), and Kaibara han (Tanba Province, 20,000 koku).
During the reign of the daimyō Nobutoshi, the Oda of Tendō Domain were signatories to the pact that created the Ōuetsu Reppan Dōmei.