was the third of the five lower castes

Japanese castes under the ritsuryo

and were the two main castes of the classical Japan caste system.When the Ritsuryō legal system was starting to be enforced in Japan at the end of the 7th century, it included, as in Tang China, a division between those two major castes. The term Ryosensei describes the whole system...

 of the Japanese ritsuryō

Ritsuryo

is the historical law system based on the philosophies of Confucianism and Chinese Legalism in Japan. The political system in accord to Ritsuryō is called "Ritsuryō-sei"...

system. A privately-owned servant, a kenin had a better social status than a slave , could be inherited but not sold, could participate to the life of the family and have one of his own.

The term can also be synonymous with gokenin

Gokenin

A was initially a vassal of the shogunate of the Kamakura and the Muromachi periods. In exchange for protection and the right to become shugo or jitō , in times of peace a gokenin had the duty to protect the imperial court and Kamakura, in case of war had to fight with his forces under the...

. The gokenin were vassals of the shogun

Shogun

A was one of the hereditary military dictators of Japan from 1192 to 1867. In this period, the shoguns, or their shikken regents , were the de facto rulers of Japan though they were nominally appointed by the emperor...

 during the Kamakura

Kamakura shogunate

The Kamakura shogunate was a military dictatorship in Japan headed by the shoguns from 1185 to 1333. It was based in Kamakura. The Kamakura period draws its name from the capital of the shogunate...

, Ashikaga

Ashikaga shogunate

The , also known as the , was a Japanese feudal military regime, ruled by the shoguns of the Ashikaga clan.This period is also known as the Muromachi period and gets its name from Muromachi Street of Kyoto where the third shogun Ashikaga Yoshimitsu established his residence...

, and 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...

s. The meaning of the term evolved in time, so its exact meaning changes with the historical period.