Tōtōmi Province in the context of "Suruga Province"

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.

Mikawa Province (三河国, Mikawa no Kuni; Japanese pronunciation: [mʲiꜜ.ka.wa (no kɯ.ɲi), mʲi.ka.waꜜ-]) was an old province in the area that today forms the eastern half of Aichi Prefecture. Its abbreviated form name was Sanshū (三州 or 参州). Mikawa bordered on Owari, Mino, Shinano, and Tōtōmi Provinces.

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

Tokugawa Yorinobu (徳川 頼宣; April 28, 1602 – February 19, 1671) was a Japanese daimyō of the early Edo period.

Born under the name Nagatomimaru (長福丸), he was the 10th son of Tokugawa Ieyasu, by his concubine Kageyama-dono. On December 8, 1603, Yorinobu received the fief of Mito, then rated at 200,000 koku, as his fief. Mito had formerly belonged to his older brother, Takeda Nobuyoshi. Following his stipend increase to 250,000 koku in October 1604, he came of age on September 12, 1606, taking the name Yorimasa, and receiving the court rank of junior 4th, lower grade (ju-shi-i-ge) and the title of Hitachi no Suke. On January 6, 1610, he was transferred to a 500,000 koku fief in Suruga and Tōtōmi Provinces (thereby founding Sunpu Domain centered on Sunpu Castle), and took the name Yorinobu. However, after a little under a decade in Suruga, he was transferred to the 550,000 koku Wakayama Domain on August 27, 1619, following the transfer of the previous rulers, the Asano clan, to Hiroshima, in Aki Province. Yorinobu thus became the founder of the Kii branch of the Tokugawa family. Yorinobu's wife, Yorin-in (1601-1666) was the daughter of Katō Kiyomasa. By the end of his life, Yorinobu had achieved junior 2nd court rank (ju-ni-i), as well as holding the title of dainagon ("major counselor").

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.

The Kōriki clan (高力氏, Kōriki-shi) was a fudai samurai clan which briefly came to prominence during the Sengoku and early Edo period Japan. Kōriki Kiyonaga (1530-1608) was a hereditary retainer of the Tokugawa clan, who served Tokugawa Ieyasu as bugyō of Sunpu and was made daimyō of Iwatsuki Domain (20,000 koku) in Musashi Province in 1590 after the Tokugawa were transferred to the Kantō region by Toyotomi Hideyoshi.

His son, Kōriki Tadafusa (1583–1655) distinguished himself in combat during the Battle of Sekigahara and the Siege of Osaka and was transferred to Hamamatsu Domain (35,000 koku) in Tōtōmi Province in 1619.