was a 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...

who fought alongside the Minamoto clan in the Genpei War

Genpei War

The was a conflict between the Taira and Minamoto clans during the late-Heian period of Japan. It resulted in the fall of the Taira clan and the establishment of the Kamakura shogunate under Minamoto Yoritomo in 1192....

. He is particularly famous for his actions at the Battle of Yashima

Battle of Yashima

The naval Battle of Yashima took place on 22 March 1185. Following a long string of defeats, the Taira clan retreated to Yashima, today's Takamatsu, just off the coast of Shikoku...

 in 1184. According to the Heike Monogatari, the enemy Taira placed a fan atop the mast of one of their ships, claiming it protected the ship from arrows, and daring the Minamoto warriors to shoot it off. Sitting atop his mount in the waves, his target atop the ship rocking as well, Nasu nevertheless shot it down with only one shot.

After the Genpei War, he was made daimyō

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 Tottori Castle

Tottori Castle

' was the central castle of the Tottori han in feudal Japan. It was a yamashiro, or 'mountain-castle', built into the mountain itself, using natural obstacles and defenses to a greater extent than man-made walls...

, but he lost this position to Kajiwara Kagetoki

Kajiwara Kagetoki

was a spy for Minamoto no Yoritomo in the Genpei War, and a warrior against the Taira. He came to be known for his greed and treachery.Originally from Suruga province, Kajiwara entered the Genpei War fighting under Oba Kagechika, against the Minamoto. After the Taira victory at Ishibashiyama in...

 after being defeated in a hunting competition. He left Echigo Province

Echigo Province

was an old province in north-central Japan, on the shores of the Sea of Japan. It was sometimes called , with Echizen and Etchū Provinces. Today the area is part of Niigata Prefecture, which also includes the island which was the old Sado Province. This province was the northernmost part of the...

 and, following the death of Minamoto no Yoritomo

Minamoto no Yoritomo

was the founder and the first shogun of the Kamakura Shogunate of Japan. He ruled from 1192 until 1199.-Early life and exile :Yoritomo was the third son of Minamoto no Yoshitomo, heir of the Minamoto clan, and his official wife, a daughter of Fujiwara no Suenori, who was a member of the...

, Nasu became a Buddhist monk in the Jodo Shinshu

Jodo Shinshu

, also known as Shin Buddhism, is a school of Pure Land Buddhism. It was founded by the former Tendai Japanese monk Shinran. Today, Shin Buddhism is considered the most widely practiced branch of Buddhism in Japan.-Shinran :...

 sect. Eventually, he formed a temple, which has since been passed down to the oldest son of the Nasu family. For administrative purposes, detailed records were kept regarding who was to inherit the temple. As a result of this, it was possible to trace the Nasu lineage right up to the destruction of the temple during World War II

World War II

World War II, or the Second World War , was a global conflict lasting from 1939 to 1945, involving most of the world's nations—including all of the great powers—eventually forming two opposing military alliances: the Allies and the Axis...

.
Most believe that he died at the age of 64, in the year 1232, during a ceremony in Kobe

Kobe

, pronounced , is the fifth-largest city in Japan and is the capital city of Hyōgo Prefecture on the southern side of the main island of Honshū, approximately west of Osaka...

 honoring those who died in the Genpei War.

In Popular Culture

Nasu no Yoichi appears in the manga Drifters

Drifters (manga)

is a fantasy, alternate history Japanese manga written and illustrated by Kouta Hirano. The manga started serialization in Shōnen Gahosha's magazine, Young King Ours on April 30, 2009...

by Kouta Hirano. He is the age of nineteen and appears very feminine.
He appears at first as a female - or, at least, the other characters believe that he is one, which leads to some confusion later on.
Typical with Drifters's genre, he is a generic fantasy archer.