was a Japanese woman of the late Azuchi–Momoyama through early

Edo period The or is the period between 1603 and 1867 in the history of Japan, when Japan was under the rule of the Tokugawa shogunate and the country's 300 regional ''daimyo''. Emerging from the chaos of the Sengoku period, the Edo period was character ...

s. Tobai-in was known for her beauty and intelligence. She was the daughter of Matsudaira Yasuchika. Her half-brother was Matsudaira Yasushige. In 1582 she was adopted by

Tokugawa Ieyasu was the founder and first ''shōgun'' of the Tokugawa Shogunate of Japan, which ruled Japan from 1603 until the Meiji Restoration in 1868. He was one of the three "Great Unifiers" of Japan, along with his former lord Oda Nobunaga and fel ...

. January 11, 1584, Ieyasu gave her in marriage to

Ii Naomasa was a general under the Sengoku period ''daimyō'', and later ''shōgun'', Tokugawa Ieyasu.Shitennō of the Tokugawa. Their son,

Ii Naokatsu was a Japanese ''daimyō'' of the Edo period who served the Tokugawa clan. He was also known as Ii Naotsugu. His childhood name was Manchiyo (万千代). Naokatsu succeeded to family headship following his father's death in 1602. Under Tokugawa I ...

was the first Lord of

Annaka Domain was a feudal domain under the Tokugawa shogunate of Edo period Japan, located in Kōzuke Province (modern-day Gunma Prefecture), Japan. It was centered on Annaka Castle in what is now the city of Annaka, Gunma. History Ii Naomasa was one of ...

Kōzuke Province was a province of Japan in the area of Japan that is today Gunma Prefecture. Kōzuke bordered by Echigo, Shinano, Musashi and Shimotsuke Provinces. Its abbreviated form name was . Under the ''Engishiki'' classification system, Kōzuke was ra ...

. Her older daughter married

Matsudaira Tadayoshi was the fourth son of Tokugawa Ieyasu with his concubine Saigo-no-Tsubone. His Childhood name was Fukumatsumaru (福松丸). When his mother died, he and his brother were adopted by Acha no Tsubone (1555-1637). His full brother, Tokugawa Hid ...

, son of

and brother of the ''shōgun''

Tokugawa Hidetada was the second ''shōgun'' of the Tokugawa dynasty, who ruled from 1605 until his abdication in 1623. He was the third son of Tokugawa Ieyasu, the first ''shōgun'' of the Tokugawa shogunate. Early life (1579–1593) Tokugawa Hidetada was bo ...

. Her younger daughter married Date Hidemune,

Date Masamune was a regional ruler of Japan's Azuchi–Momoyama period through early Edo period. Heir to a long line of powerful ''daimyō'' in the Tōhoku region, he went on to found the modern-day city of Sendai. An outstanding tactician, he was made all ...

's first son. In 1602, when Naomasa died due to injuries from

Sekigahara The Battle of Sekigahara (Shinjitai: ; Kyūjitai: , Hepburn romanization: ''Sekigahara no Tatakai'') was a decisive battle on October 21, 1600 (Keichō 5, 15th day of the 9th month) in what is now Gifu prefecture, Japan, at the end of t ...

, she became a nun. However her son was only 12 years old, so she continued to support her son as daimyō of the clan until he was of age. Tobai-in had a memorial built for her husband in

Shiga Prefecture is a prefecture of Japan located in the Kansai region of Honshu. Shiga Prefecture has a population of 1,412,916 (1 October 2015) and has a geographic area of . Shiga Prefecture borders Fukui Prefecture to the north, Gifu Prefecture to the north ...

. After her death in 1639, she was buried in

Hikone Castle is a Japanese Edo-period Japanese castle located in the city of Hikone, Shiga Prefecture, Japan It is considered the most significant historical building in Shiga. The site has been protected as a National Historic Site since 1951. Hikone is o ...

, in the

. She was also known as Seizen-in (清泉院) and Hana (花).

References

* Gunma Prefecture Historical Collection Hagiwara Susumu (in Japanese) * Toumei-in (in Japanese) * The Tokugawa family genealogy Iwasawa Izuhiko (in Japanese) {{People of the Sengoku period, State=Autocollapse 1639 deaths Japanese nobility Women of medieval Japan 16th-century Japanese people 17th-century Japanese people 16th-century Japanese women 17th-century Japanese women Matsui-Matsudaira clan Ii clan