was a retainer of the Japan

Japan

Japan is an island nation in East Asia. Located in the Pacific Ocean, it lies to the east of the Sea of Japan, China, North Korea, South Korea and Russia, stretching from the Sea of Okhotsk in the north to the East China Sea and Taiwan in the south...

ese samurai

Samurai

is the term for the military nobility of pre-industrial Japan. According to translator William Scott Wilson: "In Chinese, the character 侍 was originally a verb meaning to wait upon or accompany a person in the upper ranks of society, and this is also true of the original term in Japanese, saburau...

 clan of Takeda during the closing year 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 the fifth son of the legendary 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 Lady Yukawa), he was also known as Takeda Harukiyo (武田晴清). In 1561 Morinobu was adopted into the Nishina clan of Shinano Province

Shinano Province

or is an old province of Japan that is now present day Nagano Prefecture.Shinano bordered on Echigo, Etchū, Hida, Kai, Kōzuke, Mikawa, Mino, Musashi, Suruga, and Tōtōmi Provinces...

 as part of Shingen's plan to cement his control over the province.

When the invasion of the Takeda territory by the Oda

Oda clan

The was a family of Japanese daimyo who were to become an important political force in the unification of Japan in the mid-16th century. Though they had the climax of their fame under Oda Nobunaga and fell from the spotlight soon after, several branches of the family would continue on as daimyo...

-Tokugawa

Tokugawa clan

The was a powerful daimyo family of Japan. They nominally descended from Emperor Seiwa and were a branch of the Minamoto clan by the Nitta clan. However, the early history of this clan remains a mystery.-History:...

 alliance began in late 1581, Morinobu took on the responsibility of defending Takatoo Castle (高遠城) in southern Shinano, along with one of his allies, Oyamada Masayuki. As he fortified himself in the castle, Oda Nobutada

Oda Nobutada

was the eldest son of Oda Nobunaga, and a samurai who fought in many battles during the Sengoku period. He commanded armies under his father in battles against Matsunaga Hisahide and against the Takeda clan....

, the designated successor of Oda Nobunaga

Oda Nobunaga

was the initiator of the unification of Japan under the shogunate in the late 16th century, which ruled Japan until the Meiji Restoration in 1868. He was also a major daimyo during the Sengoku period of Japanese history. His opus was continued, completed and finalized by his successors Toyotomi...

 and commander of the Oda army, sent a Buddhist priest to negotiate surrender. However, Morinobu responded by cutting off the nose and ears of the priest and was killed in the subsequent attack at the castle. Before he conducted 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...

prior to the fall of the castle, he told attacking Oda soldiers of his prediction of Nobunaga's death, which soon came to pass.