When did knights and samurai exist?

Knights existed primarily in medieval Europe from the 9th to the 15th centuries, playing a significant role in feudal society and warfare. Samurai were prominent in Japan from the late 12th century until the 19th century, serving as warrior nobility during the feudal period. Both groups were characterized by their codes of honor—chivalry for knights and bushido for samurai—reflecting their cultural values and martial traditions.