was an 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....

 ninja

Ninja

A or was a covert agent or mercenary of feudal Japan specializing in unorthodox arts of war. The functions of the ninja included espionage, sabotage, infiltration, and assassination, as well as open combat in certain situations...

. His older brother was Hattori Masanari

Hattori Masanari

was a retainer under the Tokugawa clan during the late Sengoku period of Japanese history. He was the eldest son of Hattori Hanzō.The eldest son of Hattori Hanzō, Masanari began to fight alongside his father by the mid 1590s, and succeeded him in 1596, when he was 31 years old...

 and his younger brother was the monk Hattori Masahiro. His wife was the daughter of Ōkubo Nagayasu

Okubo Nagayasu

was a Japanese samurai of the Edo period who served the Tokugawa clan. He worked as a mining magistrate in various Tokugawa-controlled mines. Due to misconduct, he was deprived of office, and died soon afterward.-References:*http://fine-vn.com/cat_11/ent_60.html...

.
He fought his first battle at 20 years old (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...

) and went on to fight in 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...

after his brothers death at osaka he succeded him and became leader of the Iga ninja.He went on to serve lower class Tokugawa branch.