Minamoto no Yoshinaka (源 義仲, 1154 – February 21, 1184), Kiso no Yoshinaka (木曾 義仲), or Lord Kiso was a general of the late Heian Period of Japanese history. A member of the Minamoto samurai clan, Minamoto no Yoritomo was his cousin and rival during the Genpei War between the Minamoto and the Taira clans. He was born in Musashi province.
Yoshinaka's father, Minamoto no Yoshikata, was killed by Minamoto no Yoshihira in 1155. Yoshihira sought to kill Yoshinaka also, but he escaped to Shinano Province.
He was raised with Nakahara Shiro who was his milkbrother (Shiro's mother Chizuru nursed Yoshinaka and Shiro). This Shiro would later become Imai Kanehira, Yoshinaka's best friend and most loyal retainer.
Yoshinaka later changed his name from Minamoto to Kiso (木曾), to reflect the Kiso Mountains where he was raised.
In 1181, Yoshinaka received Prince Mochihito's call to the members of the Minamoto clan to rise against the Taira. Yoshinaka entered the Genpei War raising an army and invading Echigo Province. He then defeated a Taira force sent to pacify the area.
In 1183 a Taira army captured Hiuchi.
In 1183, Yoshinaka was confronted by Minamoto no Yoritomo, whose army had entered Shinano. The two reconciled and resolved to unite against the Taira. Yoshinaka then sent his son to Kamakura as a hostage.