, also known as , was a famous 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...

 and 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...

 master of the Sengoku era, credited with saving the life 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...

 and then helping him to become the ruler of united 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...

. Today, he is often a subject of modern popular culture

Popular culture

Popular culture is the totality of ideas, perspectives, attitudes, memes, images and other phenomena that are deemed preferred per an informal consensus within the mainstream of a given culture, especially Western culture of the early to mid 20th century and the emerging global mainstream of the...

.
Hanzō was born as the son of Hattori Yasunaga, a minor samurai in the service of the Matsudaira

Matsudaira clan

The was a Japanese samurai clan that claimed descent from the Minamoto clan. It first originated in and took its name from Matsudaira village, in Mikawa Province . Over the course of its history, the clan produced many branches, most of which also centered around Mikawa Province...

 (later 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:...

) clan. He would later earn the nickname because of the fearless tactics he displayed in his operations; this is to distinguish him from Watanabe Hanzo (Watanabe Moritsuna

Watanabe Moritsuna

was a Japanese samurai of the Watanabe clan, who served the Tokugawa clan. He submitted to Ieyasu in 1557 and fought in such famous battles as the battles of Anegawa , Mikatagahara and Nagashino , he was nicknamed yari no Hanzo because of his skill with the spear, it was also to distinguish him...

), who is nicknamed .

Though Hanzō was born and raised 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....

, he often returned to 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:...

, home of the Hattori family.