Mikawa Province in the context of "Matsudaira clan"

Ii clan (Japanese: 井伊氏, Hepburn: Ii-shi) is a Japanese clan which originates in Tōtōmi Province. It was a retainer clan of the Imagawa family, and then switched sides to the Matsudaira clan of Mikawa Province at the reign of Ii Naotora. A famed 16th-century clan member, Ii Naomasa, adopted son of Ii Naotora, was Tokugawa Ieyasu's son-in-law and one of his most important generals. He received the fief of Hikone in Ōmi Province as a reward for his conduct in battle at Sekigahara. The Ii and a few sub-branches remained daimyō for the duration of the Edo period. Ii Naosuke, the famed politician of the late Edo period, was another member of this clan.

The clan claims descent from Fujiwara no Yoshikado, who had been one of the Daijō daijin during the ninth century.

Shinano Province (信濃国, Shinano no Kuni; Japanese pronunciation: [ɕiꜜ.na.no (no kɯ.ɲi), ɕi.na.noꜜ-]) or Shinshū (信州; [ɕiꜜɰ̃.ɕɯː]) is an old province of Japan that is now Nagano Prefecture.

Shinano bordered Echigo, Etchū, Hida, Kai, Kōzuke, Mikawa, Mino, Musashi, Suruga, and Tōtōmi Provinces. The ancient capital was located near modern-day Matsumoto, which became an important city of the province.

Owari Province (尾張国, Owari no Kuni; Japanese pronunciation: [oꜜ.wa.ɾʲi (no kɯ.ɲi), o.wa.ɾʲiꜜ-]) was a province of Japan in the area that today forms the western half of Aichi Prefecture, including the modern city of Nagoya. The province was created in 646. Owari bordered on Mikawa, Mino, and Ise Provinces. Owari and Mino provinces were separated by the Sakai River, which means "border river." The province's abbreviated name was Bishū (尾州).

Owari is classified as one of the provinces of the Tōkaidō. Under the Engishiki classification system, Owari was ranked as a "superior country" (上国) and a "near country" (近国), in relation to its distance from the capital.

Okutono Domain (奥殿藩, Okutono-han), also known as Okudono, was a feudal domain under the Tokugawa shogunate of Edo period Japan, located in Kamo District and Nukata Districts of Mikawa Province (part of modern Aichi Prefecture), and in Saku District, Shinano Province, (part of modern Nagano Prefecture) Japan. The domain was also known as Ogyū Domain (大給藩, Ogyū-han) and later known as Tanoguchi Domain (田野口藩, Tanoguchi-han) and Tatsuoka Domain (龍岡藩, Tatsuoka-han). The ruling family was the Ogyū-Matsudaira clan.

Mino Province (美濃国, Mino no Kuni; Japanese pronunciation: [mʲiꜜ.no (no kɯ.ɲi), mʲi.noꜜ-]) was a province of Japan in the area of Japan that is today southern Gifu Prefecture. Mino was bordered by Ōmi to the west, Echizen and Hida to the north, Shinano to the east, and Ise, Mikawa, and Owari to the south. Its abbreviated form name was Nōshū or Jōshū (濃州). Under the Engishiki classification system, Mino was ranked as one of the 13 "great countries" (大国) in terms of importance, and one of the "near countries" (近国) in terms of distance from the capital. The provincial capital and ichinomiya were located in what is now the town of Tarui.

Tōtōmi Province (遠江国, Tōtōmi no Kuni; Japanese pronunciation: [toː.toꜜː.mʲi (no kɯ.ɲi)]) was a province of Japan in the area of Japan that is today western Shizuoka Prefecture. Tōtōmi bordered on Mikawa, Suruga and Shinano Provinces. Its abbreviated form name was Enshū (遠州). The origin of its name is the old name of Lake Hamana.

The Ogasawara clan (Japanese: 小笠原氏, Hepburn: Ogasawara-shi) was a Japanese samurai clan descended from the Seiwa Genji. The Ogasawara acted as shugo (governors) of Shinano Province during the Sengoku period (c. 1185–1600), and as daimyō (feudal lords) of territories on Kyūshū during the Edo period (1600–1867).

During the Kamakura and Muromachi periods, the clan controlled Shinano province, while related clans controlled the provinces of Awa, Bizen, Bitchū, Iwami, Mikawa, Tōtōmi and Mutsu. According to some theories, the Miyoshi clan and the Mizukami clan were descendants of the Ogasawara clan.