was a commander and 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...

 in the service of Tokugawa Ieyasu

Tokugawa Ieyasu

 was the founder and first shogun of the Tokugawa shogunate of Japan , which ruled from the Battle of Sekigahara  in 1600 until the Meiji Restoration in 1868. Ieyasu seized power in 1600, received appointment as shogun in 1603, abdicated from office in 1605, but...

 in 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...

 during the Azuchi-Momoyama

Azuchi-Momoyama period

The came at the end of the Warring States Period in Japan, when the political unification that preceded the establishment of the Tokugawa shogunate took place. It spans the years from approximately 1573 to 1603, during which time Oda Nobunaga and his successor, Toyotomi Hideyoshi, imposed order...

 and Edo period

Edo period

The , or , is a division of Japanese history which was ruled by the shoguns of the Tokugawa family, running from 1603 to 1868. The political entity of this period was the Tokugawa shogunate....

s.

In 1563, when an uprising against Ieyasu occurred in Mikawa Province

Mikawa Province

is an old province in the area that today forms the eastern half of Aichi Prefecture. It was sometimes called . Mikawa bordered on Owari, Mino, Shinano, and Tōtōmi Provinces....

, Masanobu took the side of the peasants against Ieyasu. He fled from the Tokugawa, rejoining them in the 1570s or 1580s at the behest of Ōkubo Tadayo

Okubo Tadayo

was a samurai general in the service of Tokugawa Ieyasu in the Azuchi-Momoyama period, subsequently becoming a daimyō in early Edo period , Japan.Ōkubo Tadayo was the eldest son of Ōkubo Tadakazu, a hereditary retainer of the Tokugawa clan...

, and accompanied Ieyasu as he crossed Iga Province

Iga Province

was an old province of Japan in the area that is today western Mie Prefecture. It was sometimes called . Iga bordered on Ise, Ōmi, Yamato, and Yamashiro Provinces.-Geography:...

 following the assassination of Oda Nobunaga at Honnō-ji.

Masanobu joined Tokugawa Hidetada

Tokugawa Hidetada

was the second shogun of the Tokugawa dynasty, who ruled from 1605 until his abdication in 1623. He was the third son of Tokugawa Ieyasu, the first shogun of the Tokugawa shogunate.-Early life :...

's army for the march along the Nakasendō

Nakasendo

The , also called the , was one of the five routes of the Edo period, and one of the two that connected Edo to Kyoto in Japan. There were 69 stations between Edo and Kyoto, crossing through Musashi, Kōzuke, Shinano, Mino and Ōmi provinces...

. En route, however, Hidetada attacked Sanada Masayuki

Sanada Masayuki

was a Japanese Sengoku period daimyo. He was the third son of Sanada Yukitaka, a vassal daimyo to the Takeda family in Shinano province. He is known as a master strategist. Sanada Nobuyuki and Sanada Yukimura were his sons.-Biography:...

 at Ueda Castle

Ueda Castle

Ueda Castle was the original home of the Sanada clan, built by Sanada Masayuki.It was this castle that the Sanada defended twice from the Tokugawa, first in 1583 and again in 1600, putting up a very impressive defense both of those times....

 against Masanobu's advice, and together they arrived late for the Battle of Sekigahara

Battle of Sekigahara

The , popularly known as the , was a decisive battle on October 21, 1600 which cleared the path to the Shogunate for Tokugawa Ieyasu...

.

Masanobu was a member of the Tokugawa shogunate

Tokugawa shogunate

The Tokugawa shogunate, also known as the and the , was a feudal regime of Japan established by Tokugawa Ieyasu and ruled by the shoguns of the Tokugawa family. This period is known as the Edo period and gets its name from the capital city, Edo, which is now called Tokyo, after the name was...

 and ruled a Han in Sagami Province

Sagami Province

was an old province in the area that is today the central and western Kanagawa prefecture. It was sometimes called . Sagami bordered on Izu, Musashi, Suruga provinces; and had access to the Pacific Ocean through Sagami Bay...

 assessed at 20,000 koku

Koku

The is a Japanese unit of volume, equal to ten cubic shaku. In this definition, 3.5937 koku equal one cubic metre, i.e. 1 koku is approximately 278.3 litres. The koku was originally defined as a quantity of rice, historically defined as enough rice to feed one person for one year...

. He was present at the Siege of Osaka

Siege of Osaka

The was a series of battles undertaken by the Tokugawa shogunate against the Toyotomi clan, and ending in that clan's destruction. Divided into two stages , and lasting from 1614 to 1615, the siege put an end to the last major armed opposition to the shogunate's establishment...

 in 1614. Masanobu died several weeks after Ieyasu in 1616.

Further reading