was a Japanese daimyo

Daimyo

is a generic term referring to the powerful territorial lords in pre-modern Japan who ruled most of the country from their vast, hereditary land holdings...

 of the Sengoku period

Sengoku period

The or Warring States period in Japanese history was a time of social upheaval, political intrigue, and nearly constant military conflict that lasted roughly from the middle of the 15th century to the beginning of the 17th century. The name "Sengoku" was adopted by Japanese historians in reference...

. Born Takeda Tarō (武田 太郎), he was the son of Takeda Shingen

Takeda Shingen

, of Kai Province, was a preeminent daimyo in feudal Japan with exceptional military prestige in the late stage of the Sengoku period.-Name:Shingen was called "Tarō" or "Katsuchiyo" during his childhood...

, by Shingen's wife,
. He came of age in 1550, and took the formal name of Yoshinobu, receiving the "yoshi" from the 13th Ashikaga shogun, Ashikaga Yoshiteru

Ashikaga Yoshiteru

, also known as Yoshifushi or Yoshifuji, was the 13th shogun of the Ashikaga shogunate who reigned from 1546 to 1565 during the late Muromachi period of Japan. He was the eldest son of the 12th shogun, Ashikaga Yoshiharu; and his mother was a daughter of Konoe Taneie...

. In 1552, to further Takeda-Imagawa ties, he married a daughter of Imagawa Yoshimoto

Imagawa Yoshimoto

was one of the leading daimyo in the Sengoku period Japan. Based in Suruga Province, he was one of the three daimyo that dominated the Tōkaidō region. He was one of the dominant daimyo in Japan for a time, until his death in 1560....

. While Yoshinobu served for a time as lord of the Takeda clan, he rebelled against his father, and was captured and imprisoned together with Obu Toramasa

Obu Toramasa

, known as the "Wild Tiger of Kai", was a Japanese samurai of the Sengoku period, who served the Takeda clan. He was the tutor of Takeda Shingen's younger brother Takeda Nobushige. He later betrayed Shingen with Shingen's eldest child, the rebellious Takeda Yoshinobu. A historically accurate...

. Yoshinobu committed suicide by seppuku

Seppuku

is a form of Japanese ritual suicide by disembowelment. Seppuku was originally reserved only for samurai. Part of the samurai bushido honor code, seppuku was either used voluntarily by samurai to die with honor rather than fall into the hands of their enemies , or as a form of capital punishment...

. Yoshinobu's nephew Nobukatsu (son of his half-brother Katsuyori

Takeda Katsuyori

was a Japanese daimyo of the Sengoku Period, who was famed as the head of the Takeda clan and the successor to the legendary warlord Takeda Shingen. He was the son of Shingen by the , the daughter of Suwa Yorishige...

) replaced him as lord of the Takeda clan who also was responsible for his death.