Here's the summary for the wikipedia article you mentioned in your comment:

Samurai (侍、さむらい) were the hereditary military nobility and officer caste of medieval and early-modern Japan from the late 12th century until their abolition in the late 1870s during the Meiji era. They were the well-paid retainers of the daimyo, the great feudal landholders. They had high prestige and special privileges. Following the passing of a law in 1629, samurai on official duty were required to practice daishō (wear two swords). Samurai were granted kiri-sute gomen: the right to kill anyone of a lower class in certain situations.

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